In some cases, there’s also a 16 digits version of IMEI number that contains information on the device’s software version. When the phone is lost or even stolen, then the authorities can search the phone from the pool of phones sold in the world. Terrestrial Cellular network is the network you use when you are making phone calls, sending messages or even when you want to access an internet connection.Ī standard IMEI number is made up of 14 string of digits. It identifies all the devices that are using Terrestrial Cellular network. It’s a unique number that is used to identify a mobile device. IMEI stands for International Mobile Equipment Identity Number. If you are one of those phone owners who are just concerned about making calls, receiving calls and sending SMS and nothing else, then I can be pretty sure that you don’t know what IMEI number is. If you already own a mobile device, then you should be knowing what an IMEI number is. 17.2 iCloud Unlock iPhone, iPad & iWatch.