Sprint is CDMA, def a no no...IMO nothing but problems with them. T-Mobile is GSM, but will be soon going out of business (being bought out). ATT is GSM and Verizon is CDMA...both companies are great, good customer service w/o any problems. Really it comes down to who you know on each network for the UNLIM FREE in-network calling. And/or what phones you like better on each company. I have had all the carriers, right now on a family 4 line plan on verizonwireless, and very happy with the customer support and service/quality of their product.
In the long run, no matter what, in the next 5 years anticipate ATT and Verizonwireless being the only Major carriers here in the U.S.
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