Questions about mobile phone short messages

Problem description:

What does it mean that there is a short message expiration date in the sending settings in the mobile phone?

Analysis:

With the popularity of mobile phones, communication between people has become more and more convenient and fast. Besides the basic voice service, SMS, as a rising star, has become the most popular way of communication. A greeting from colleagues, a few whispers from lovers, a few blessings from relatives and friends, and the interest of life are all among them. Express your feelings with your mobile phone and communicate in words. Anytime, anywhere, not limited by time and space, the cost is relatively low. These advantages have prompted more and more people to join in and become "SMS maniacs". However, how much do you know about short messages when you are immersed in them all day? Let me briefly introduce short messages.

? First, the concept of SMS

? "SMS service" means that GSM users' mobile phones can receive short messages with a length of no more than 160 characters sent by other users, no matter whether they are turned off, talking or calling forward. Even if the customer is out of coverage or turned off, the SMS service center can store these messages for the customer. Once the user is turned on or returns to the network, the center will send this information to the customer to ensure the reliability and confidentiality of information transmission. Customers with Chinese mobile phones can also receive financial quotes, weather forecasts, news and entertainment information sent by SMS service center after applying for Chinese service. Short message service is a rapidly developing service with the growth of mobile phone users. It is a special service provided by GSM system to mobile phone users. Generally speaking, short message is the function of leaving short messages on mobile phones, which is essentially different from traditional voice transmission and communication services. Chinese SMS is based on all Chinese mobile phones. When Motorola cd928+, the first all-Chinese mobile phone in China, went on the market, the first Chinese short message was quietly sent out. ...

Since then, the momentum of short messages has been like a surging river, endless; There is a flood like the Yellow River, which is out of control. Ah! Sorry for the string, hehe.

? Two. Sms parameters

? Short message length:

? Since it is a short message, there is a limit to the number of words sent. Only 160 English characters can be sent at a time, and one Chinese character takes up two English characters, so a short message can only send up to 80 Chinese characters at a time (the length here is generally for short messages). It should be explained here that some mobile phones now support the function of long short messages, and can write 20 1 Chinese characters at a time to send. In fact, this is only that the mobile phone can input 20 1 character at a time, and the short message center can only send 80 Chinese characters at a time, so the mobile phone that supports long short messages only sends short messages to the short message center, and then the short message center sends them out in three times. So the fee is also three times.

? SMS service center number setting:

? First, make sure that the SMS service has been opened in your city, make sure that your mobile phone supports Chinese SMS, and then enter the number of the local SMS service center in the SMS settings (query the business hall of local mobile or Unicom). After setting it up, you can send and receive text messages.

? Receiving and sending short messages:

? After receiving the short message, the mobile phone will send out a prompt tone or vibration to remind you to receive the short message. At this point, you can check your message. When your mobile phone is turned off or out of service, the short message will be stored in the short message center, and then the short message center will continue to send this short message to your mobile phone for a certain period of time until your mobile phone is turned on or connected to the network and can receive this short message. I don't have to say much about texting. People who can use mobile phones will definitely send text messages. Ha ha. (Dongli shouts: I won't! ! I pour wine ...)

? Storage and validity of short messages;

? When you finish reading your message, you can choose to delete it or save it. Ordinary mobile phones can only save short messages in SIM, so if you choose to save, please make sure that your SIM card has a place to save short messages. However, some models on the market can support storing short messages on the fuselage, such as nokia83 10 and Siemens 36 18. This is a great convenience for those crazy people who send text messages. As I said above, when the mobile phone is not turned on or out of service area, the text messages sent or received are all saved, and wait for a certain time before sending or receiving them. This time is the validity period of the text messages. After this time, this message will be permanently deleted. So you'd better set the validity period of SMS on your mobile phone to the longest time.

? The parameters and settings of SMS are very simple. As long as you make the corresponding settings and check them carefully, you can basically send and receive text messages.

? Third, the evolution of SMS: SMS→EMS→MMS

? Sms: SMS is the abbreviation of short message service, which means short message service. In other words, data streams carrying characters, numbers and symbols can be transmitted between mobile phones. It was put forward and determined as the GSM standard in 1980s. Short messages are all the rage among people, but with the craze for short messages, people find that short messages can only send boring words, and the form is too simple and not vivid. So people need more vivid and humanized short messages. As a result, a new generation of SMS came into being.

? EMS: EMS is the abbreviation of enhanced short message service, which means enhanced short message service. It can combine simple * * *, pictures, even animations and words and send them to each other between EMS-enabled mobile phones. We often see that mobile phones such as Ericsson T68 and Siemens 2 1 18 all support EMS. There are similarities between EMS and SMS, only a simple improvement. Get rid of the monotonous text form of short messages and bring us more vivid and colorful short messages. These are conducive to the promotion of EMS. However, EMS is only a standard set by several mobile phone manufacturers, and it is not very smooth to send EMS between mobile phones of various brands. Therefore, EMS can not replace SMS as a whole and become a new generation of SMS.

? MMS: MMS is the abbreviation of multimedia messaging service, which means multimedia messaging service. This term first appeared in the early 1980s, but it didn't enter the commercial market until the early 1990s, and it didn't spread rapidly around the world until 1999, and it continued to erupt. MMS is a further development of SMS and EMS, which is jointly formulated by WAP Forum and 3GPP(3G Partnership Project). Its carrier can be GPRS or 3G. Mobile phones supporting MMS can send MMS messages including text, sound, image and video to each other. MMS also supports mobile phone greeting cards, mobile phone maps, business cards, interactive videos and other multimedia services. At this point, MMS no longer belongs to the category of short messages, and the restrictions on the size and format of information are already very small. Moreover, with the increase of network bandwidth and the enhancement of mobile phone memory and processor, the capacity of MMS will be greater. However, there are gains and losses. Compared with the low cost of SMS, the cost of MMS can be said to be very high, about 3 to 5 times that of SMS, almost the same as voice service. This is a headache for those Internet vendors. How to attract more people to use MMS is what they have to do. Not long ago, the first multimedia message based on GPRS was sent in Shenzhen, China, which proved that a more humane and colorful era is not far away.

? From SMS to MMS, from the initial text to the current video and sound, SMS has gone through more than ten years. People are willing to accept this change, after all, it is beneficial to us. There may be better and more perfect changes in the future, but I believe that the spirit of communication between people will never be dimmed by any changes. Wow, it's just a feeling Don't throw rotten eggs at me ! ! )

? Four. Short message sending process

? Do you know how short messages are sent, stored and received by the other party? Let me take mobile communication as an example and introduce it to you!

? GSM user short message sending process: User A sends a short message to User B. First, User A sends a short message and submits it to the short message center. Short message center is the processing center responsible for saving and forwarding short messages. If the short message center successfully receives the short message, the mobile phone of user A will display "Sending Success" at this time, and if the submission fails, it will display "Sending Failure". Then the short message center submits the short message to the mobile switching center where user B is located (the mobile switching center is responsible for sending the short message). If the mobile switching center successfully receives and sends a short message, it will feed it back to the short message center. At this point, if user A starts the SMS reply report, the SMS center will send a short message to user A, telling him that the other party has received it. Then the mobile switching center will send a short message to the short message center where user B is located, and then send a short message to user B from the short message center. The whole sending and receiving process is completed.

? The SMS sending process of Shenzhouxing users: The SMS sending process of Shenzhouxing users is basically the same as that of GSM users, except that Shenzhouxing users pre-store phone bills, so an item is added in the sending process, that is, after user A sends the SMS to the SMS center, the SMS center will not submit the SMS to the other party's mobile switching center, but first go to service control point to check whether the phone bill balance of user A is sufficient. If the phone bill balance of user A is sufficient, the SMS center will submit the SMS to the other party. Then the next process is basically the same as that of GSM users.

? In fact, the whole process of texting is very simple, and users only need to find out what the basic responsibilities of each service center are. Don't be confused!

? By the way, say one more thing. Now China Unicom and China Mobile can send messages to each other. This sending process is also very simple, but after receiving the short message, Unicom's short message center will pass through Unicom's gateway, then send it to Unicom's short message center and then send it to the user's mobile phone. (Alas, let's stop here, I'm dizzy myself ...)

? V. Problems in SMS

? Having said that, you should know something about SMS. Although SMS is very popular now, and this trend seems to be growing, there are inevitably some problems to be solved in SMS. For example, short messages are blocked, and short messages cannot be sent to users in time due to channel congestion. This is obviously still technically flawed. For example, the content of short messages is chaotic, and some pornographic and reactionary words or pictures spread around with short messages, causing adverse effects. Some people cheat by SMS. Therefore, the management of short messages should be strengthened in the future. Moreover, the most troublesome point is the emergence of SMS virus. Hackers use some program loopholes in SMS websites to attack some mobile phone numbers. Sending a large number of spam messages will not only affect normal communication, but even cause cell phone paralysis. These are the disadvantages of short messages at this stage, which may cause serious problems if not solved in time. Telecom and network operators should not only see the huge benefits brought by short messages, but also invest blindly. They should work hard on the management and coordination of short messages!

? The reason why SMS can become a new fashion is entirely related to its convenience and low cost. No one would have thought that simple short messages would have such a big market. The reason is that SMS has changed people's access to information and become a brand-new and relatively independent way of interaction. This "new, strange and fast" form is in line with the tastes of young people now. In addition, various services and contents related to SMS are gradually developing and expanding. You can receive all kinds of information, entertainment, games and so on by SMS. It's not hard to see why short messages are so popular. In the future, the development of SMS will be more turbulent. I believe that in the near future, it is not a problem to download a "blockbuster" by SMS and watch it slowly at home!