Note IV PRO unlocked HUGE Tablet/Phablet 5.5inch - HD screen edge, IPS 960x540 pixels Unlocked Smartphone Cellphone+ Unlocked world GSM phone. 3G - 850/2100, 2G -850/900/1800/1900. Compatible with at&t, T-Mobile, Straight Talk, Simple Mobile and other GSM networks. Please make sure your SIM card is not locked with PUK code 3G- 850/2100 bands. Fully compatible with at&t, stright Talk & Net10 at 2G/3G. compatilble with T-Mobile & Simple Mobile at 2G. For Straight Talk, Trac fone, 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 fee Dual SIM Card Dual Standby(one Micro SIM card and one standard sim card)