After acquiring AT&T, Cingular sold most of its current GSM network to T-Mobile, who was leasing towers from Cingular and providing service to their customers. AT&T Wireless (bought by Cingular) was the only TDMA (not CDMA) network carrier who not converted their network to GSM, but built brand new GSM towers for a new service (note, they are not linked at all and ATT/Cinguar has been trying really hard to have their customers switch). However, it requires total network rebuilding, reprogramming and takes a tremendous amount of time. The link you posted was simply verizon's definition of GSM and yes many companies want to shift to GSM because it is simply more advanced. Why buy a phone when he already own one? Just get the Tmo SIM card and be done.What in the world are you talking about? I can gurantee you 100% Verizon is not currently using the GSM network.
Their phones often do not use SIM cards.īut anyway, back to the OP's question. More accurate to say would be that Verizon is not a GSM service. Other phones, that are designed stricly for CDMA do not. Phones on the Verizon network do have SIM cards (for example the Treo 650 that I am looking at right now that my sister in law owns) and they could even be unlocked to use on T-mobile or other networks. Interestingly even Verizon touts GSM as the way to go. GSM and CDMA are the competing communications standards (for lack of a better word) in use.
SIM stands for Subscriber Identity Module and is the little card in the back of the phone. Well, sorry to be a stickler, but, and I just did my research on this, we should not be talking about apples and oranges.
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