Unlocked Smartphone N8000 5 Inch Screen Android 4.0 Smart Phone Dual SIM 1 x Smart Phone 1 x Battery 1 x Power Adapter 1 x Earphones GSM 850/900/1800/1900MHz, 3G:WCDMA 2100MHZ 1 x USB Cable 1 x Phone Case Compatible with at&amp;t, T-Mobile, Straight Talk, Simple Mobile and other GSM networks(It is not compatible with Verizon or Sprint) The left sim card slot is for 3G network of AT&T, T-mobile, the right sim card slot is for 2G network. To get AT&T or T-mobile internet, please use a standard sim card from AT&T or T-mobile, put it in the left sim card slot; don't put it in the right card slot