How to check if a mobile phone has been opened and activated?

The first step is to check the mobile phone serial number (IMEI)

The so-called mobile phone serial number is just like the ID card of the mobile phone. Since the IMEI number of each mobile phone is unique, Generally speaking, this can be used to determine whether a mobile phone is genuine. The identification method is as follows: In the standby state of the mobile phone, enter "?#06#"? excluding quotation marks. The string of numbers displayed on the mobile phone is its motherboard serial number. Write it down; remove the battery of the mobile phone and look at the body of the mobile phone. The serial number on the white label among the two labels at the back is the chassis serial number, and the other label is usually the network access license. Is it consistent with the number noted earlier? Look at the IMEI number on the mobile phone box and compare the three to see if they are consistent. If the mainboard serial number is inconsistent with the case serial number, or even the mainboard serial number is not displayed or is a series of strange numbers or symbols, then the machine is most likely to have been repaired or assembled from different parts, and you must not buy it. If the three serial numbers are consistent, and there is a network access license, it can basically prove that the machine is genuine, but it cannot be 100% sure, because today's unscrupulous businessmen can fake anything, and the motherboard serial number can be used Computers and software can be flashed, and fake serial number labels and network access licenses can be purchased for just a few dollars. To be cautious, you should continue to verify according to the following method.

The second step is to look at the outer packaging and operating instructions of the mobile phone

The packaging and instructions of regular new mobile phones are beautifully printed, mostly printed on coated paper, and the fonts and images are very clear and layered. , but most of the counterfeit packaging boxes are simple imitations of single-sided paper. The fonts and images are dry and rough, and the printing is blurred. Many modified instructions from informal channels are even copied. Although some refurbished mobile phones use the original genuine packaging box and manual, after all, the machine is old, and the packaging box must have wear and tear, and the manual must also have traces of use. Pay more attention when purchasing, and you can find it.

The third step is to check the network access license

There is a watermark on the real network access license, and the color on the surface is uneven, dark and light, thick and thin; and there are many fake ones For copying, there is no change in surface color. If you can't see it, you can also use a banknote detector to take a picture of the network access license. Is there really an anti-counterfeiting pattern inside? It will show a red "CMII" pattern. , while the fake pattern is blurry. Genuine network access licenses are usually printed with dot matrix printers, and the numbers are clear. If you look carefully, there are dents made by the pins, while fake network access licenses are printed with ordinary printers, and the numbers are not very clear and there are no dents. Generally speaking, it is difficult to fake network access licenses because the equipment required for counterfeiting is relatively high in cost. In addition, you can also check the authenticity of the network access license by checking the Internet, which will not be explained in detail here

The fourth trick is to look at the mobile phone case

When you open a brand new mobile phone, you will It is obvious to note that the "key parts" of mobile phones have manufacturers' films for key protection, such as the inner and outer screens of new mobile phones, the lenses of camera phones, etc., because as long as these parts come into contact, fingerprints will be left. So when you see the fingerprint on your new phone, don’t listen to the vendor’s explanations. In addition, dust and traces of use are also unavoidable for refurbished mobile phones. The gaps between the upper and lower shells of the mobile phone, the gaps around the keyboard, and the charger slot are all places where dirt can easily hide. There will also be traces of use on the hinge, so you should also pay special attention to it.

The casings commonly used in refurbished mobile phones are imitations of the original ones, or are carefully polished from old casings. Therefore, the front and rear parts of the mobile phone casing are prone to not closing tightly and leaving large gaps. The identification method is to use your fingernails to see if they can be inserted into the seam between the upper and lower covers of the mobile phone. If it can be inserted, the case is assembled.

For those mobile phones that have not had their shells replaced, merchants spray them with a detergent-like mist before selling them, and the surface of the old shells will immediately have a matte effect like a new phone. If the buyer is not careful, If you check, you will be fooled by unscrupulous merchants, but it will not take long for the spray paint on the casing to fall off. You must carefully observe the casing when buying, because no matter how good the craftsmanship of the merchant is, it will not be as advanced as the original equipment. If you look carefully, you can see some small particles? They are dust, caused by not working in a vacuum room when spraying paint. If it is a flip machine, you can also check the joints of the flip cover, because sometimes, no matter how well the vendor handles the surface of the machine, there will inevitably be traces of dust left in these places.

Also check whether the screws on the fuselage are brand new and whether there are any signs of being turned by a screwdriver. What's more important to note is that many new mobile phones have a distinct smell of sandalwood, while old mobile phones and case changers generally do not have such a smell, or have odors left during processing.

The fifth step is to look at mobile phone accessories

If it is a new mobile phone from a regular manufacturer, it should have a full set of original accessories, and at least one battery and one charger. The accessories of refurbished mobile phones are generally not complete or are not original products. Before purchasing a mobile phone, it is best to go to the relevant website to find out what the standard original accessories are, so as to prevent the dealer from deducting accessories. In addition, if you find scratches on the matching charger and headphone plug, then the phone is probably not brand new.

The sixth step is to check the usage records

Look at the games, text messages, phone book, call records, self-made ringtones and other items in the mobile phone to see if there are any records left by use. , if so, it is highly suspected of renovation. In addition, during normal use, if the phone frequently shuts down automatically or freezes, it can be said with certainty that there is a certain problem with the phone's motherboard or software.

The seventh tip is to check the warranty

Ask the dealer about the warranty period of the mobile phone and ask for a formal invoice. Refurbished mobile phones cannot enjoy all the rights and interests stipulated in the "Three Guarantees" of regular mobile phones, so they generally have no warranty period or a relatively short warranty period. If the seller says that they are responsible for the warranty, they cannot agree, because regular mobile phones are generally covered by a nationwide joint warranty. If the seller can't do this, there must be something wrong with the phone.

The eighth trick is to look at the price

As the saying goes, if you are greedy for small gains, you will suffer big losses. Before consumers buy a mobile phone, it is best to check the price of the mobile phone in the local newspaper or website. If the price quoted by the mobile phone dealer is "very cheap", you should be wary. Such a "cheap" mobile phone is not a refurbished one. Mobile phones and informal channel products are just accessories. It is recommended that consumers purchase mobile phones from regular sales stores with good reputation and high service, and have complete three-guarantee certificates, valid delivery invoices and three-guarantee cards. In this way, when there is a problem with the mobile phone, the legitimate rights and interests can be guaranteed

The ninth tip

You can take out the battery and smell if there is a pine smell inside the mobile phone. If there is, then It may be a refurbished machine