How-To Geek

Mobile Equipment ID (MEID)

Prior to 2005, CMDA cell phones (such as those used on the Sprint and Verizon networks) were identified by a 32-bit number known as an Electronic Serial Number. By 2005 the explosion of cellphone users had depleted the pool of ESNs so severely that a replacement was required. The MEID, with 56-bits, offers a much larger pool of numbers to pull from.

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