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 Originally Posted by v3treonut
A few points worth considering here.
1. If data access is very important to you, then Cingular might be your best bet for now. I've found they have the best data access coverage almost everywhere I've traveled within the US. Business cohorts of mine with either Verizon, Sprint, and TMobile lost their data access when with me in several US locations and mine on Cingular worked. Verizon is close behind CNG and may be almost the same these days. All of them are running a race on this issue.
Verizon has gaping holes in data coverage, including a few large cities like OKC and several major highway corridors (I-65 and I-20 in Alabama, part of the Pennsylvania Turnpike, etc.) Sprint doesn't have a lot of rural data coverage but doesn't have the massive holes in "city" and highway coverage that Verizon does.
For domestic use, as far as data coverage goes, I'd recommend Sprint first, then T-Mobile with an unlocked GSM 650, then Cingular, then (dead last) Verizon. For international use, T-Mobile is generally better than Cingular unless you spend a lot of time in the Caribbean; Sprint has a moderate amount of CDMA roaming in Caribbean, Latin American, Pacific Rim and Middle Eastern countries (but none in Europe, where use of CDMA is forbidden), while Verizon has even less. (You can get GSM roaming with Sprint and Verizon via use of a GSM phone and SIM that is linked to your normal CDMA service.)
As for Atlanta coverage: Sprint has a relatively weak network around Atlanta, but it's by no means bad. Verizon has apparently oversold their network in Atlanta and coverage has deteriorated badly over the past several months, to the point of being worse than Sprint in many cases. Cingular and T-Mobile tend to be more stable, although I'm hearing more and more complaints of dropped calls with Cingular in a few areas, particularly Sandy Springs (an area where Verizon tends to have chronic problems too.)
-SC
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