What is a mobile phone?

Name: mobile phone

Chinese Pinyin: shǒu jī

English: cellphone, mobile telephone

Additional explanation: handset, combined set, mobile phone

Abbreviation for handheld mobile phone.

[Edit this paragraph] Introduction

Mobile phones are usually called mobile phones. In Japan, Hong Kong and Taiwan, they are often called mobile phones and flashlights. In the early days, they were also commonly known as Big Brother. A portable telephone terminal that can be used in a wide range of applications.

The so-called second-generation mobile phones (2G) currently used most widely around the world are mainly GSM and CDMA. They are all digital. In addition to voice communication, they can also send and receive text messages (short messages, SMS), MMS (multimedia messages, multimedia messages), Wireless Application Protocol (WAP), etc. GSM is the most popular in mainland China and Taiwan, and CDMA and PHS mobile phones are also popular. The entire industry is currently in the process of migrating to the third generation of mobile phones (3G).

The appearance of a mobile phone should generally include at least one LCD screen and a set of buttons (some mobile phones with touch screens have fewer buttons).

In addition to typical phone functions, some mobile phone keyboards also include PDA, game consoles, MP3, cameras, photography, recording, GPS and more functions, and are developing towards PDAs with mobile phone functions. trend.

The mouthpiece and earpiece of the telephone and the corresponding microphone and receiver are all mounted on a single handle. Formerly known as mobile phones, portable phones, and mobile phones, it is a portable phone terminal that can be moved within a large range.

[Edit this paragraph] Development history

1G

The first generation of mobile phones (1G) refers to analog mobile phones, that is, in the 1989s and 1990s Big Brother appeared in Hong Kong, American and other film and television productions in the 1900s. The first person to develop Mobile Phone was Dr. Cooper of Motorola in the United States. Due to constraints such as battery capacity limitations at the time, analog modulation technology requiring huge antennas, and the development of integrated circuits, this kind of mobile phone had a boxy appearance and could only be moved but not considered portable. Many people call this kind of mobile phone "Brick" or "Black King Kong".

This kind of mobile phone has many standards, such as NMT, AMPS, and TACS. However, it basically uses frequency division multiplexing for voice communication. The reception effect is unstable, and the confidentiality is insufficient. The wireless bandwidth is Underutilized. The mobile phone is similar to a simple duplex radio. The call is locked to a certain frequency, so the call can be eavesdropped using an FM radio.

2G

The second generation mobile phone (2G) is also the most common mobile phone. Usually these mobile phones use very mature standards such as PHS, GSM or CDMA, and have stable call quality and suitable standby time. In the second generation, in order to meet the needs of data communication, some intermediate standards are also supported on mobile phones, such as GPRS that supports MMS services and WAP services that support Internet services, as well as various Java programs.

3G

3G is the abbreviation of 3rdGeneration in English and refers to the third generation of mobile communication technology. Compared with the first generation of analog mobile phones (1G) and the second generation of digital mobile phones (2G) such as GSM and CDMA, the third generation of mobile phones generally refers to a new generation of mobile communication systems that combine wireless communications with multimedia communications such as the Internet. . It can handle a variety of media forms such as images, music, and video streams, and provides a variety of information services including web browsing, teleconferencing, and e-commerce. In order to provide this service, the wireless network must be able to support different data transmission speeds, which means that it can support at least 2Mbps (megabytes per second) and 384kbps (kilobytes per second) in indoor, outdoor and driving environments respectively. seconds) and a transfer speed of 144kbps.

3G mobile phones

Compared with the first generation analog mobile phones (1G) and the second generation GSM, TDMA and other digital mobile phones (2G), 3G communication has many names, and ITU regulations It is the "IMT-2000" (International Mobile Telephone 2000) standard, and European telecommunications giants call it "UMTS" Universal Mobile Telecommunications System.

Currently, there are three international standards for 3G handsets: the European WCDMA standard, the American CDMA2000 standard and the TD-SCDMA standard proposed by Chinese scientists.

Now "3G communication" is about to become a mantra on people's lips. The so-called 3G, in fact, its full name is 3rd Generation, and the Chinese meaning refers to the third generation of digital communications. The first generation of digital mobile phones that came out in 1995 could only make voice calls; the second generation of digital mobile phones that appeared from 1996 to 1997 added the function of receiving data, such as receiving emails or web pages; the third generation and the first two generations of mobile phones The main difference is the improvement in the speed of transmitting voice and data. It can handle various media forms such as images, music, and video streams, and provide a variety of information services including web browsing, conference calls, e-commerce, etc. Compared with the first generation of analog mobile phones (1G) and the second generation of digital mobile phones (2G) such as GSM and TDMA, 3G communications have many names. The ITU stipulates the "IMT-2000" (International Mobile Telephone 2000) standard, and the European Telecom giants call it "UMTS" Universal Mobile Telecommunications System. The standard stipulates that when a mobile terminal is moving at vehicle speed, its transmission data rate is 144kbps, when it is stationary or walking outdoors, the data rate is 384kbps, and when indoors it is 2Mbps. But these requirements do not mean that the user-available speed can reach 2Mbps, because the indoor speed will also depend on the detailed frequency planning in the building and the close cooperation between the organization and the operator.

Future mobile phones

Future mobile phones will focus on security and data communications. On the one hand, we will strengthen the protection of personal privacy, and on the other hand, we will strengthen the research and development of data services. More multimedia functions will be introduced. Mobile phones will have more powerful computing capabilities and become personal information terminals, instead of just having calls and text messages. function.

Mobile phones will become more intelligent, miniaturized, secure and multifunctional.

Current mobile phones

The most widely used mobile phones in the world are GSM mobile phones and CDMA mobile phones. GSM is the most common in mainland China and Taiwan. CDMA and PHS mobile phones are also popular. These are so-called second-generation mobile phones (2G). They are all digital. In addition to voice communication, they can also Can send and receive text messages (short messages, SMS), MMS (technology)|MMS (multimedia messages, multimedia messages), Wireless Application Protocol (WAP), etc.

[Edit this paragraph] Mobile phone type

Mobile phone type, as the name suggests, refers to the external type of mobile phone. Nowadays, the more commonly used classification is to divide mobile phones into foldable (single screen, dual screen) ), upright type, sliding type, rotating type, etc.

Single-screen foldable

Foldable mobile phone refers to a clamshell mobile phone, which requires opening the cover to see the main display or buttons, and has only one screen. Known as a single-screen flip phone. At present, dual-screen flip phones are also launched on the market, that is, there is another secondary display screen on the flip cover. This screen is usually not large and can generally display functions such as time, signal, battery, and caller ID.

Upright type

An upright type mobile phone means that the mobile phone screen and buttons are on the same plane, and the mobile phone does not have a flip cover. The main feature of upright mobile phones is that you can directly see the content displayed on the screen.

Sliding type

Sliding type mobile phone mainly means that the entire body of the mobile phone must be seen by pulling it out. On some models, you can see the keys by sliding the lower cover; on others, you can see the keyboard by pulling up the screen part. To a certain extent, slider phones are an extension and innovation of flip phones.

Watch-style

Wrist-style mobile phones are mainly mobile phones that are worn in the hand like a watch. They are compact in design and have the same functions as ordinary mobile phones.

The rotating type

It is similar to the sliding type. The most important thing is that you can see the keyboard after rotating 180°.

[Edit this paragraph] Types of mobile phones

Business mobile phones

Business mobile phones, as the name suggests, target business people or people working in state agencies and units. Group of mobile phone products. Business mobile phones are very popular due to their powerful functions. Industry experts pointed out: "A good business phone should help users achieve fast and smooth communication and complete business activities efficiently."

Camera Phone

Camera A mobile phone is a type of mobile phone, that is, a mobile phone with a built-in camera function. The world's first camera phone was the J-SH04 manufactured by Japan's Sharp Corporation in November 2000. As expected, this camera phone uses a CMOS image sensor module (CMOS for short) because CMOS can save more power than the CCD image sensor module used in digital cameras at the time. Prevent the battery of your phone from running out quickly due to the use of the camera.

Mobile phones for the elderly

With the improvement of people’s health and the extension of life span, the proportion of the elderly in the population is increasing. The elderly group, which accounts for nearly one-third of the population, needs their own mobile phone with easy-to-operate functions. After Serote took the lead in launching mobile phones for the elderly, many manufacturers followed suit and developed their own brands of mobile phones for the elderly.

Practical functions: large screen, large fonts, large ringtones, large buttons, large call tones;

Convenient life: professional software (visualization, simple menus, clear structure), One-touch dialing, banknote verification, flashlight, hearing aid, voice reading phone book, reading text messages, reading incoming calls, reading dialing)

Not only that, but also has the function of improving the quality of life of the elderly: external radio, Peking Opera, one-click distress (a high-decibel distress tone is emitted after pressing the button, and a distress call and distress text message are sent to the designated number at the same time.), daily recipes (preferably downloadable and updated online), and grocery shopping lists.

Music mobile phones

Music mobile phones actually focus more on music playback functions in addition to the basic functions of a phone (making calls, sending text messages, etc.). It features good sound quality, long-lasting music playback time, and shortcut keys for music playback. At present, the better music mobile phones include NOKIA XM series and Sony Ericsson's WALKMAN series, and other brands are also involved in this type of mobile phones.

Game phones

Game phones are mobile phones that focus more on gaming functions. The characteristic is that there are buttons specially set for games or buttons that are convenient for gaming, and the screen is generally not small. For example, Nokia N-GAGE platform mobile phone (Nokia N81).

Invisible mobile phone

Invisible mobile phone is a high-end smart handheld computer mobile phone. In addition to its powerful business functions and continuous handwriting, as the name suggests, the most sought after thing is its "invisibility" Function. The so-called "invisibility" means that you can answer and receive phone calls and text messages as you wish, and all those you do not want to answer or receive will be filtered. Second, except for the owner himself, no one can see the text messages sent and received, nor the call records. Third, important business cards are automatically hidden. The most powerful thing is not just the invisibility problem, but also the fact that others have no way of knowing whether there are calls, text messages, or important business cards. With this phone, even if it is lost, your important personal information will not be compromised at all.

Smartphone

Smartphone, to put it simply, is a simple "1+1=" formula, "PDA+mobile phone=smartphone". Broadly speaking, in addition to the call function of a mobile phone, a smartphone also has most of the functions of a PDA, especially personal information management and browser and email functions based on wireless data communication.

Smartphones provide users with sufficient screen size and bandwidth, which are convenient to carry around and provide a broad stage for software operation and content services. Many value-added services can be launched here, such as: stocks, news, weather, transportation, commodities, Application downloads, music picture downloads, and more. Smartphones integrating 3C (Computer, Communication, Consumer) will surely become the new direction of mobile phone development in the future.

Several necessary conditions for a smartphone:

1. It has all the functions of an ordinary mobile phone and can make normal calls, send text messages and other mobile applications.

2. Have the ability to wirelessly access the Internet, that is, it needs to support GPRS under the GSM network or CDMA 1X, wifi, or 3G network under the CDMA network.

3. Equipped with PDA functions, including PIM (Personal Information Management), calendar notes, task arrangements, multimedia applications, and web browsing.

4. It has an open operating system. On this operating system platform, more applications can be installed, so that the functions of smart phones can be infinitely expanded.

Operating System

▼Symbian OS: Fashionable because of its popularity, with the widest support and wider reach.

Symbian currently has a reasonable and stable design, and is supported by many manufacturers, so it has a promising future. Now its web application is very strong. The 9-key one-handed operation is very comfortable. Basically no shortcomings. Symbian is very much like a combination of Windows and Linux. It has a good interface, uses kernel and interface separation technology, has relatively low hardware requirements, and supports C, VB and J2ME. Representative models: Nokia N95, Nokia E90, Nokia N96, etc.

▼WM: is Microsoft’s software platform for Pocket PCs and Smartphones. Windows Mobile extends the familiar Windows desktop to personal devices.

Windows Mobile is the "mobile version of Windows" launched by Microsoft for handheld devices. Devices using the Windows Mobile operating system mainly include mobile phones, PDAs, portable music players, etc. There are four types of Windows Mobile operating systems, namely Windows Mobile for PocketPC Edition, Windows Mobile for PocketPC Phone Edition, Windows Mobile for Smartphone Editon, and Windows Mobile for Portable Media Centers. The latest version is Windows Mobile 6.1. Advantages: 1. The interface is similar to desktop Windows, making it easy for people who are familiar with computers to operate. 2. Rich pre-installed software, built-in Office Word, Excel, Power Point, can be browsed and even edited, built-in Internet Explorer, Media Player. 3. Computer synchronization is very convenient and fully compatible with Outlook, Office Word, Excel, etc. 4. The multimedia function is powerful and can play almost any audio and video files in mainstream formats with the help of third-party software. 5. Touch operation, comparable to iPhone. 6. An extremely rich range of third-party software, especially dictionaries and satellite navigation software, can be run. Disadvantages: 1. The operation is complicated for people who are not familiar with computers. 2. The current maximum camera size is five megapixels (Samsung I900, 2008). 3. High hardware requirements. 4. The size is slightly larger, and many operations require the help of a touch pen.

Mainstream hardware configurations of Windows Mobile handheld computers and mobile phones: CPU: 195-624 Mhz, major chip manufacturers: Intel, Texas Instruments, Samsung, Qualcomm, etc., memory: 64-128MB Ram (for program running), 128-256MB Rom ( Used for third-party programs and user file storage), display screen: 240x320 or 480x640, 65,000 colors, 2.4-3.5 inches, expansion card: Micro SD or SD, SDHC, high-end models have built-in WiFi wireless network receiving module, GPS satellite reception Module, FM radio receiving module, 3G or 3.5G high-speed network, equipped with Bluetooth and USB interface for synchronization with computer. HTC Diamond, launched on May 6, 2008, is the flagship model of Windows Mobile. It has caused a sensation in the world of mobile phones and mobile devices. Its momentum is close to that of the iPhone. Its main performance is as follows: Windows Mobile 6.1 Professionel, CPU: Qualcomm 524 Mhz, 128 MB Ram, 256 MB Rom, 4 GB built-in storage, 7.2Mb/s HSDPA 3.5G high-speed network access, 2.8-inch VGA display, WiFi, GPS satellite receiver, FM radio, Bluetooth 2.0 port, 3 million Pixel camera with flash, 3D screen display, Micro SD memory card.

▼Linux: Give you a reason to love it, but it lacks security and low performance.

Linux has the advantages of open source code, low software licensing fees, and abundant application development talent resources, making it easy to develop personal and industry applications. Started too late, without a solid foundation. Representative models: Motorola A760, Samsung i519.

▼Palm OS: Please look at me again, there are very few single-function users.

Palm, this kind of system has very low hardware requirements, so the price can be well controlled and the power consumption is also very small. The distinguishing feature is that it is much faster than other systems and is comfortable to operate. If you don't know how to use it, the stability is not good (you will be fine once you are familiar with it). But there are relatively few in China, and there are few Chinese people writing software for it. The web application is also poor. Representative model: Samsung SGH-i500Treo 600.

[Edit this paragraph] Mobile phone brands

European and American mobile phones

Nokia, Sony Ericsson, Motorola, Philips, Palm, HP, Apple, BlackBerry, Disney, Al Carter, O2, i-mate, Vertu, mobiado, Ericsson, Siemens, Sagem, Lucent, GOOGLE

Japanese and Korean mobile phones

NEC, SK, Sharp, Pantech, Kyocera , Weikai, Panasonic, Oriental Dragon, Mitsubishi, Toshiba, Sanyo, Sony Ericsson, Hyundai, Samsung, LG,

Domestic mobile phones

Dopod, Lenovo, Serote, Bird, Qixi, Amoi, Konka, TCL, Haier, BBK, Mitac, ASUS, BenQ, Coolpad, OKWAP, Huawei, UTStarcom, ZTE, Hisense, OPPO, Skyworth, Unicom, GT Giti, CECT Gigabyte . , Hengji Weiye, Huayu, Yitian, Jinpeng, Desai, Wanshitong, FIC Volkswagen, Quanzhi, Hongkang, Shengtai, IDOTSD, Green Power, Eastcom, Capital Letter, Nanjixing, Weiao, Guangxin, Elite, Du Bao, Putian, VOSIA, Aoxiang, Kesheng Communications, Zhongxun, Tianchuang, Gaoxinqi, Meizu, Hantaifu Rizhongbaohuixun, Banghua, Chenxing, Gaoke, Baojie, Xunhai, Nuozhongyi, Newman, Jiayuan, Guoxin, Jinzheng, Yidong, Preda, HKC, Zhaoxun, Dajunyu Shenai, Gosbell, Yichengyou, Cinda, Zhongheng, Lianxinxin, Zhongqiao, Kono, Zhiji, Yaxunda, Tianyuan, New Post, Mingteng, Kejian, Xohua, Panda, Southern Hi-tech, Datang, Top Dibit, Inspur, Zhongqiao Digital, Unisplendour, UNISNEO, Aosheng , Beluga

Hong Kong mobile phone

Many friends have some misunderstandings about the concept of "Hong Kong mobile phone", thinking that Hong Kong mobile phones are fake and have quality problems. Hong Kong mobile phones are mobile phones sold in the Hong Kong market. There are formal sales methods and sales channels for these products in Hong Kong. Hong Kong licensed products are not fake. Some friends may feel on tenterhooks when the words "Hong Kong licensed products" are mentioned, and they always feel that Hong Kong licensed products are unreliable. On the contrary, compared to domestic licensed products, Hong Kong products are genuine original products. Since it is produced by the original factory, there is absolutely no need to worry about the hardware, and the operation and functions are the same as those of domestic products. Due to the tariff differences between the mainland and Hong Kong, manufacturers' pricing in the mainland and Hong Kong is also different. Even for mobile phones officially sold in Hong Kong, there is a big price difference between them and mobile phones of the same model in mainland China. Some mobile phone sellers transfer the products that were originally sold in Hong Kong to the mainland through one or other channels, and smuggle them directly from Hong Kong back to Shenzhen. Therefore, the backs of mobile phones licensed in Hong Kong have the labels of specialty stores and Hong Kong mobile operators. .

Supplement: Hong Kong mobile phones are actually divided into licensed and parallel imports. Mobile phones purchased at regular Hong Kong electrical appliance chain stores (such as Gome, Fortress, and Broadway, etc.) will be issued by the seller. These mobile phones are only called licensed in Hong Kong and have the right of manufacturer (such as Nokia, Motorola, Samsung, etc.) ) provide customer service and after-sales service, such as one-year warranty. Some also provide nationwide joint insurance. However, Hong Kong mobile phones purchased in parallel import stores in Hong Kong do not have formal invoices, and they cannot enjoy after-sales service from customer service in Hong Kong. They can only pay for maintenance at the place of purchase. Due to warranty reasons, there is still a big difference in price between Hong Kong Bank and Hong Kong Water.

In fact, the price of mainland mobile phones is very cheap due to competition from domestic series. There is basically no price difference between the domestic National Bank and the Hong Kong Bank, and the National Bank is even cheaper.

Many businesses in China use Hong Kong water to pretend to be Hong Kong companies, which is actually a very unkind approach, because Hong Kong water will not be guaranteed no matter where it is obtained.

The method of identifying Hong Kong and Hong Kong water is actually very simple: Hong Kong water charger plugs all use the British-style large triangle head (three feet, each is square), while Hong Kong water chargers Then there is everything colorful.

Does the Hong Kong bank mobile phone have Simplified Chinese?

Generally speaking, mobile phones licensed in Hong Kong are in Traditional Chinese, and they also have Simplified Chinese. Like domestic licensed mobile phones, they all have Simplified Chinese (except for some models from manufacturers that do not have Simplified Chinese). If the menu is in English Or other languages, the relative price will be cheaper.

Hong Kong Bank mobile phone warranty:

Hong Kong Bank mobile phone is guaranteed by Hong Kong for one year.

[Edit this paragraph] Related terms

Roaming

Roaming is a term commonly used by mobile phone users. It means that users of cellular mobile phones can continue to use their mobile phones in some other regions or countries when they leave their own region or country.

Roaming can only be done between domestic cities with compatible network standards and already connected to the Internet, or between regions or countries that have signed bilateral roaming agreements. Implementing the roaming feature is technically quite complex. First of all, the user's location must be recorded, and a profit settlement method must be established between operating companies.

SIM card

Also known as subscriber identification card, it is a data card for digital mobile phones. It records the user's identity and key, which can be used by the GSM system to identify the user. authenticate the identity of the user and encrypt the user’s voice information. The SIM card effectively prevents theft, paralleling and eavesdropping of voice information.

SIM cards are divided into large and small cards with exactly the same functions and are suitable for different types of digital mobile phones. The phone can only be used with a SIM card installed. The SIM card can be inserted into any mobile phone of the same type, and the call charges will be automatically charged to the card user's bill.

GPRS

GPRS is the English abbreviation of "General Packet Radio Service". It is a new network superimposed on the existing GSM network. It makes full use of the existing Mobile communication network equipment adds some hardware equipment and software upgrades to the GSM network to form a new network logical entity. It is based on packet switching technology and adopts IP data network protocol, which enables the data business of the existing GSM network to break through the limit of the maximum rate of 9.6kbit/s, and the maximum data rate can reach 170kbit/s. Such a high data rate, for For the vast majority of mobile users, it is more than enough. Through GPRS, users can use various high-speed data services while on the move, including sending and receiving emails, Internet browsing and other IP business functions.

Dual-SIM dual-standby

Dual-SIM dual-standby refers to a mobile phone that can hold two SIM cards at the same time, and both cards are in standby mode. Dual-SIM dual-standby on the market generally refers to dual-SIM dual-standby of the same network standard, that is, dual-SIM dual-standby of GSM network, dual-SIM dual-standby of CDMA network, dual-SIM dual-standby of PHS network; dual-SIM dual-standby mainly refers to the first This situation is GSM dual card dual standby. Currently, there are relatively few or almost no dual-SIM dual-standby mobile phones in the CDMA and PHS formats on the market.

USIM card

USIM card is the third generation mobile phone card. Many people believe that in the 3G era, most applications can only be implemented by mobile phones, and the limited resources on the card only need to implement the authentication function. Indeed, 3G applications are very complex, and most applications cannot be completed through STK cards alone. However, the USIM card can not only perform a simple authentication function. Facts have proved that it is gradually transitioning to a mobile commerce platform and even a multi-application platform. It is no longer necessary to implement other applications such as electronic wallets, electronic credit cards, and electronic bills on mobile phones. Difficult matter. This feature makes the USIM card a medium for cross-field cooperation and mutual penetration between different industries. For example, banks can participate in telecommunications operations, and vice versa.

In addition to supporting multiple applications, the USIM card has also upgraded its security algorithm and added a card-to-network authentication function. This two-way authentication can effectively prevent hackers from attacking the card. . At the same time, the USIM card's phone book function is more powerful and can store up to 500 phone numbers. For each phone number, the user can also choose whether to enter other information, such as email, aliases, other numbers, etc.

Despite the faltering steps, 3G is still coming to us step by step. The high 3G license fee may be one of the reasons why many operators are hesitant to move forward. More importantly, they hold a wait-and-see attitude towards 3G applications. Moreover, there are still many problems that need to be solved to implement multi-applications based on USIM cards. For example, the relevant specifications are not perfect enough, there is a lack of mobile phones that support such multi-applications, and more importantly, multi-party coordination between operators and relevant enterprises or government agencies will increase. The difficulty of this kind of application is great. In any case, the third generation mobile communication cards have made technical preparations in this regard. It is believed that multiple applications based on USIM cards will eventually be widely used in the 3G era.

[Edit this paragraph] Mobile phone - first aid maintenance

Mobile phones are always available for backup. In addition to high usage, they are relatively safe in case of unexpected situations such as accidents or premature degradation of functions. Higher than any electrical product in your home. To deal with common symptoms of mobile phones, such as accidental flooding of the phone or intermittent automatic shutdown due to accidental falls, sending it to the factory for repair is certainly the best way. However, if you have some basic mobile phone first aid knowledge, you can do it before sending it for repair. Rescue can reduce losses and save the life of your mobile phone.

Rescue a water-logged mobile phone

It is most common for mobile phones to get wet in the rain and accidentally fall into the water. If you are really unlucky, please do not hesitate and turn off the power immediately. And remove the battery to prevent water droplets from corroding the machine board. Then sending it for repair as soon as possible is an emergency measure. In addition, using a hair dryer to dry the moisture inside the phone (only use warm air) can also slow down the corrosion of the board by moisture and is also an emergency measure.

If you have a sudden thought and still install the battery and continue to use it, it may still operate normally at that time, but at most half a month later, the machine board you ignored will be corroded to the point of being irreparable. The normal operation seen before was actually just an illusion.

When using a hair dryer to dry your phone, remember to set the temperature to the lowest setting. If the heat is too strong, the rubber on the phone may deform.

Rescue from automatic shutdown

Many users have experienced the situation where the mobile phone suddenly shuts down automatically when the power is sufficient and in standby mode. The reasons may be as follows: Possibility:

1. The protection circuit in the lithium battery is too sensitive, so the power is cut off when the current is high

2. The battery itself is aged

3. Mobile phone Accidental water intrusion (some mobile phones are not waterproof)

4. There is dirt on the metal sheet at the battery contact position, causing poor power contact

5. The connection between the battery and the mobile phone Bits can loosen easily.

If after inspection, it is found that the first two problems are found, then you must go to a maintenance shop for repair.

But if it is the latter two, the problem is only caused by the dirty and oxidized "battery metal sheet". As long as it is wiped clean with a glue stick, the situation will be improved. Placing paper or film between the battery and the mobile phone can also solve the problem of poor contact caused by loose batteries.