Are there any rumors of iPhone being used with carriers other than Cingular?

Answer 1

Since Cingular had to rework their system to provide the features and was given exclusivity to pay for that change,
No

Answer 2

lol, unfortunetally, the answer is no. cingular will be the only provider. its kind of expensive to switch providers, but im still definitally going to buy one. i preordered mine though, so it comes out to be much cheaper. Try going to this site and type in your Zip Code. http://doiop.com/theappleiphone
they will show you different stores in your area offering a pre-ordered iphone as well a prices. its really helpful.