Will the IMEI definitely change after replacing the motherboard of the mobile phone? Is there such a thing as a blank motherboard?

Yes. Because the serial number is the certificate of the mobile phone. If the motherboard is changed, the serial number will definitely change. It sounds like the other party may have used parts from other machines to install it. Because some places cannot be synchronized. It's ready to use.

The motherboard has indeed been replaced. If it is a real motherboard, whether it is a parallel import or a licensed version, it must have an IMEI. If this motherboard does not have an IMEI, it means that the motherboard was replaced by a fake HTC produced by a black factory. Motherboard, because the Android system is now licensed for free, so all domestic motherboards can now be equipped with the Android system;

This is why imitation mobile phones from HTC or Samsung and other Android camps are sold on Taobao There are so many and so cheap, because the motherboards are all fake, produced by small manufacturers, and the cost is very low.

Extended information:

When the mobile phone is stolen, if you know the IMEI code, you can lock the mobile phone through the mobile phone provider, that is: learn the stolen mobile phone number and stop using the mobile phone. Call function to learn the location of your phone.

IMEI codes are suitable for GSM and WCDMA mobile phones and Iridium satellite phones, while CDMA mobile phones use MEID codes, which are different from IMEI codes. Every GSM mobile phone sold through formal channels in the world has a unique IMEI code.

IMEI codes are planned by the GSMA Association and authorized by regional organizations to allocate them. In China, the Telecommunications Terminal Testing Technology Association (TAF) of the Ministry of Industry and Information Technology is responsible for the network access certification of domestic mobile phones. Other allocation agencies include British BABT, American CTIA, etc.