Mobiper N4 Smartphone Android 4.4 MTK6582 5.7 Inch Screen 3G GPS At&t net10 straight talk-white Mobiper N4 Smartphone Android 4.4 MTK6582 5.7 Inch Screen 3G GPS At&t net10 straight talk-white Please make sure your SIM card is not locked with PUK code Unlocked world GSM phone. 3G - 850/2100, 2G -850/900/1800/1900. Compatible with AT&T (3G), T-Mobile (2G), Straight Talk, Simple Mobile and other GSM networks 3G HSPA+ - 850/2100 bands. Fully compatible with AT&T, Stright Talk(AT&T Tower) & Net10 (AT&T Tower) at 3G HSPA+. Compatilble with T-Mobile, Simple Mobile, Straight Talk(T-Mobile Tower) & Net10 (T-Mobile Tower) at 2G (EDGE). For Straight Talk, Simple Mobile or Net 10 will requires a manual APN setup Free Tether - Use your 3G data service as a WiFi hot spot and connect your notebook, ipad or other device for free. No need to pay monthly tether fees Unlocked cell phones are compatible with GSM carriers but are not compatible with CDMA Carriers.