What is it the Passport?

IMEI (International Mobile Equipment Identity) is a number unique to every GSM and UMTS mobile phone that usually consists of 15 digits. The first 8 digits (the so-called TAC/Type Allocation Code) include information on the model and origin of the phone. The remainder of the IMEI is a serial number with a Luhn check digit at the end. In Sony Ericsson mobile phones IMEI usually has the following format: XXXXXXXX-XXXXXX-X-XX. The last 2 digits are not part of IMEI.