LG G Vista 2 H740 4G LTE Stylus Smartphone (GSM Unlocked) DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is GSM unlocked it will work on any GSM Network with a Micro size SIM Card The sim card does not come included, you will need to contact your Network Provider to acquire your complimentary Sim card (Free from most Carriers with activating of an account). WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: The Phone supports the flowing Technology GSM HSPA LTE 2G: 850 900 1800 1900 3G: HSDPA 850 1900 2100 4G: LTE band 1(2100) 2(1900) 3(1800) 4(1700/2100) 5(850) 7(2600) 12(700) 29(700) 30(2300) Please contact your network Provider and inquer if they support these bands in your area to ensure the device will work Properly. HOW LONG CAN IT LAST ME: A removable BL-51YF 3,000mAh battery that lasted for 18 hours of continuous streaming in our tests. as well as 648 hours in Standby mode. WHAT DOES UNLOCKED REALLY MEAN: Unlocked devices are compatible with GSM carriers the kinds that Use SIM Cards for Service like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers) Unlocked Devices will not necessarily support CDMA Carriers the kinds that don't use sim cards for service like Sprint, Verizon, Boost or Virgin, it's always best to contact them prior to purchasing to confirm their compatibility on the bands supported by this device. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WILL NOT WORK ON VERIZON OR SPRINT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!