@jjg You can get a breakdown of the compatible bands here http://www.gsmarena.com/meizupro5-7573.php You may be able to get 3G on AT&T (the 850/1900). I'm using T-Mobile and their 3G bands are 1700/2100 AWS and 1900 in some places. I suspect that the 1900 band is too weak where I'm at limiting me to 2G ultimately.