This is a GSM phone and works world wide with all GSM carriers. Not for CDMA Carriers like Verizon Sprint ETC. Works with at and t 3G . T mobile 3G is not compatible with this model. Check your carrier's 3G bands prior to purchase. GALAXY GRAND offers maximum screen space on a slim, fully loaded smartphone for an endlessly entertaining mobile experience. Enjoy your videos, games and web time on a large, vivid display while holding it in one hand. Its bigger screen and slimmer body is ideal for playing games, watching videos or surfing the web.