US discount cell phone plans?

[Joe Pfeiffer]

Dylan Semler writes:
>On 1/20/07, Joe Pfeiffer <jjpfeifferjr at comcast.net> wrote:
>>
>> Since I'll be buying this phone, is anyone aware of a provider in the
>> US who will give a discount on a plan if you don't get a phone with
>> it?
>
>
>Speaking of US providers, since the phone is GSM, are cingular and T-mobile
>our only options?  I'm not too familiar with which carriers use which
>technology.

wikipedia has a list of providers and technologies at
http://en.wikipedia.org/wiki/List_of_United_States_mobile_phone_companies
A brief look gives the impression that T-Mobile and Cingular (which is
renaming itself AT&T) seem to be the only major ones.