Since the release of the iPhone, AT&T has had an exclusive contract with them.
(Yes.)
Yes. The iPhone 4 came out. For AT&T it came out on June 2010. For Verizon it came out on February 2011
An iPhone 3G cost about $299.00 or $199.00
You don't "have" AT&T, the iPhone comes with the ability to connect to AT&T.
No, T-mobile does not have the iPhone. AT&T has it though.
T-Mobile does not have the Iphone only At&t does
There will not be an iPhone 4S for T-Mobile but you can get any iphone unlocked at unlockatt.com
No it is not. It is for AT&T unless you "jailbreak" and "unlock" an iphone. Instructions to do this can be found on the internet.
The iPhone 5c is newer. The 5c came out on September 20, 2013 and the 5 came out on September 21, 2012.
Yes, AT&T sells the iPhone in the store. You do not have to go to Apple to purchase one.
Yes. AT&T has always carried the iPhone since 2007.
AT&T doesn't sell the iPhone 3GS in white.
The iPhone 2nd generation