Not without voiding the warranty
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.
In the U.S., if you have an original iPhone, you hook it up to the computer and activated through iTunes. However, if you have an iPhone 3G, you need to take it to an AT&T store, or an Apple store to get it activated.
AT&T. But you can "unlock" an iPhone for verizon.
Yes, but only if you unlock you iphone
No, unless you illegally unlock it.
It's not it will only be available with AT&T unless you unlock it.
you can tbuy an iphone without at&t.....
at&t is the est factory that offers unlocking services for iPhone 4.
No. The iPhone must be activated before it can be used. You activate iPhone by using iTunes on your computer. You will need a credit card or debit card, access to the Internet and an email address. However, the newer iPhone 3G must be activated either at the store (AT&T store in the US) or at an Apple store.
Well, you have a 2-year service contract with At&t so you better check out that you can change your billing address and emails and name and everything first..
You can unlock your iPhone 3Gs anywhere if you have internet:)
Apple N berry annouced about the permenent IMEI unlock method for the new AT&T iPhone. I found about the subject from the google. May be it help your or not. Check the related link for it