A:Answer Yes. Below is an excerpt from my chat transcript with a Best Buy customer care agent:
You: Will an iphone for AT&T also work on the T Mobile network?
Customer Care agent: Yes, an iPhone purchased for AT&T can work on the T-Mobile network as both carriers use GSM technology
You: So, why does the Apple Geek Squad Certified Refurbished iphone have "(AT&T)" in the description if it can also work with T Mobile? Will there be any limitations?
Customer Care agent: Actually, the "(AT&T)" label usually means the device was originally locked to AT&T2. However, Geek Squad Certified Refurbished iPhones are often unlocked after their refurbishment process. Once unlocked, these iPhones can function on other GSM networks like T-Mobile
