http://www.techradar.com/news/nokia-3310-3g-in-usa-available-to-buy

There was a lot of love for the new Nokia 3310 last year, but none of that came from the US, where the 2.5G phone didn't work on American networks.

Enter the Nokia 3310 3G. It's the faster version of the retro phone, and it works with GSM carriers, meaning AT&T and T-Mobile (but not Verizon and Sprint).