Can I use my AT&T Iphone4 for US Cellular?

I bought the Iphone4 two years ago under AT&T. I stopped going with AT&T and switched to US Cellular so I stopped using my iphone and got a different phone (us cellular didn't have the iphone then.) well now us cellular DOES have iphones and I'm wondering if I will be able to take my iphone4 and activate it under us cellular now?

Yes, it is possible to switch phone companies and still be able to use your current phone. Just tell them that when you sign up to your new cell phone company.

The phone has to be unlocked. If you finished your contract with AT&T, they may be willing to unlock the phone for you. If not, you'll have to hack the unlock.