Gordon Huff, did transcribed the following::
> Mark Crispin wrote:
>> On Fri, 29 Feb 2008, danny burstein posted:
>>>>> SO... for domestic US users, the choice would only be ATT (gsm) or
>>>>> T-Mobile
>>>>> (gsm)
>>>> Or Suncom.
>>> Or Dobson. Or Constoga.
>>
>> Dobson is now part of ATT.
>>
> or Advantage, or Aradigm or Alaska Wireless or Alltel or CellularOne
> or ANW or Arctic Slope Cooperative or CT Cube or Caprock Celluar or
> Centennial or West Central Wireless or Chariton Valley or Amerilink or
> Cincinnati Bell or Coleman or Commnet or Concho or Convoy or Cordova
> or Corr or MBO or BigFoot or ...
>
> depending on where you live and work, you could have allotta choices!
> Regards

I believe that all those above use the AT&T (I think its there
backbone?) service.
Or any vendor that has a service agreement with AT&T to handle
sellphones using the
ATT network.