The GSM Association maintains a unique system known as the IMEI Database (IMEI DB). The IMEI DB is a global central database containing basic information on serial number (IMEI) ranges of millions of GSM and 3G devices (e.g. mobile phones, laptop data cards) that are in use across the world's GSM networks. The IMEI is a 15-digit number that is used to identify the device when it is used on a GSM mobile phone network. The IMEI must be unique for each GSM device, so there needs to be a way of m...