N3 Smartphone Android 4.2 MTK6582 Quad Core 5.7 Inch 1GB 8GB IPS HD Screen- Black N3 Smartphone Android 4.2 MTK6582 Quad Core 5.7 Inch 1GB 8GB IPS HD Screen- Black 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. Please make sure your SIM card is not locked with PUK code. 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 Sim Card Dual SIM Card Dual Standby (One micro SIM card) this is not a samsung phone,it will not fit samsung cases. Unlocked cell phones are compatible with GSM carriers but are not compatible with CDMA Carriers.