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Old 11-07-2010, 06:55 AM   #2 (permalink)
MidnightDraven
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You could try actually looking at the blackberry website before buying models, it will tell you if its GSM (sim slot) or CDMA (no sim slot) or a CDMA with sim slot for international use.

AT&T is GSM, and therefore has SIM slots, and uses IMEI.
ESN is typically used by CDMA carriers.

A "bad ESN" means one that is blocked and cannot be registered with a carrier.
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