LG G Stylo 4G LTE Mobile 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 Standard size SIM Card The sim card does not come included and 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: B2 (1900 PCS) B4 (1700/2100 AWS 1) B12 (700 ac) B1 (2100) UMTS B2 (1900 PCS) UMTS B4 (1700/2100 AWS 1) UMTS B5 (850) 850 GSM 900 (E-GSM) GSM 1800 (DCS) GSM 1900 (PCS) HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 2900mAh which in a Usage time frame means 10 solid hours of Usage streaming at 4G LTE speeds as well it has a Standby time of up to 10 days before you need to recharge the battery DOES 4G MEAN THIS DEVICE IS THE 4TH GENERATION STYLO: No. All 4G means is that this device supports the latest technology in Network broadband so that you'll have a better connection to the network and more reliable service with less dropped calls (the sale is for it they first generation Stylo). please note this device is unlocked from the MetroPCS Network and will have some preloaded MetroPCS applications that will be irremovable though irrelevant to the functionality of the device WHAT DOES UNLOCKED REALLY MEAN: Unlocked devices are compatible with GSM carriers 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 work with CDMA Carriers like Sprint, Verizon, Boost or Virgin. The Device is Internationally Compatible in many Countries that support GSM Frequencies (contact your network provider prior to purchasing for verification that they support GSM frequencies that are listed above)