CDMA carriers like Sprint, Verizon, Cricket, MetroPCS, Boostmobile,VirginMobile,Pageplus, are use an ESN (Electronic Serial Number) or MEID to identify different phones.
If there is an unpaid balance associated with the phones serial number, or the phone was reported lost or stolen by the owner this phone has a BAD esn, meaning the carrier will NOT activate it.
If the Phone has a good ESN you will not have any problems activating it.
A MEID has two formats, DEC and Hex. Some Carriers such as cricket will not accept a MEID in HEX form, and it will have to be converted. You can convert your MEID here .
For more information on MEID's please check out the Resources page or feel free to send an email or text.
BEFORE YOU BUY CHECK THE ESN!!! YOU CAN CHECK THE ESN FOR ALL MAJOR CDMA CARRIERS FREE HERE!