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Wirelessly posted (BlackBerry9630/5.0.0.732 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/104)
GSM is another type of network. At&t and t-mo are GSM carriers. Sprint and verizon uses the CDMA network. GSM phones uses SIM cards and CDMA does not.
Changing phones when you're carrier is GSM is a lot easier because as long as the phone you buy is sim unlocked (regardless which carrier its made for), all you have to do is pop in your sim card and voila!...you're good to go. We don't have that capability on CDMA phones.
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