SIM cards, or Subscriber Identity Modules are required to identify every GSM phone, regardless of the system. They also contain account, data and payment parameters to tell the selected carrier the ...
I manage about 126 GSM devices. Everything from old AT&T Nokia phones to T-Mobile Blackberries to GPRS air cards. I'm sick and tired of depending on the providers to help me do simple things. So I'd ...
Wireless carriers sell you “postpaid” contract phones at a considerable discount. The carrier expects to recoup its outlay — the full price of the equipment — over the life of the contract that you ...
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