Netgear Unite Mobile WiFi Hotspot 4G LTE GSM Unlocked White 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: This device will support B17 (700) and B4 (1700/2100) on the 4G Spectrum. and B5 (850), and B2 (1900) on the 3G Spectrum. HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 2500mAh 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 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 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WILL NOT WORK ON VERIZON OR SPRINT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!