LG G3 Vigor D725 4G LTE (Silk White) 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, if you will be using this device with a Network Other than AT&T 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: Data Transmited over the folowing Network Typs GPRS, EDGE, HSPA+, GSM Quad Band, UMTS Tri Band, LTE, VoLTE*. LTE bands 2/4/5/17 GSM 850/900/1800/1900 MHz; UMTS 850/1900/2100. HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 1800mAh which in a Usage time frame means 17.5 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 26 days 11 hours before you need to recharge the battery (Taken from the manufacturer take with a grain of salt). WHAT CAN I EXPECT OUT OF THE BOX: Well the G3 Viger comes running Android Android 4.4 KitKat with 8 GB of Storage (up to 3.7 GB usable memory) with a Quad-Core Processor Clocked at 1.2GHz 8MP Rear Camera and a 1.3MP Selfy Camera and weighs a meer 4.7 OZ. 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 work with CDMA Carriers the kinds that dont use sim cards for service like Sprint, Verizon, Boost or Virgin (contact your network provider prior to purchasing for verification that they support GSM frequencies).