A number ID, which is universal for any mobile phone new CDMA in the world, unique, and that is the phone for the network, identify and can grow to declare the phone lost or stolen has been used . MEID is a replacement for ESN ( the serial number of the electronics ) is in the year 2005, replace the ESN . Number, ESN., the 32-bit number, MEID, etc. 56-bit . A ESN the 32-bit means only 4 billion number, ESN, unique there . There are other restrictions, phone, CDMA, compression, late 2005, which are produced ESN, unique ends, and this is a major problem for the industry . MEID, 56-bit, 16 million times the number of unique like the system, the ESN provides and to the world, helps ensure that other number to the end doesn't arrive . Although support MEID have to have all the new phones CDMA be added and all the CDMA networks have to support MEID upgrade find . The MEID for the phone, GSM and WCDMA equivalent of the IMEI . MEID also for compatibility with IMEI for phones that include CDMA technology and GSM or WCDMA. is designed.