ZTE Altair (2nd Gen) 3G QWERTY Keyboard Phone - 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: GSM: 850, 900, 1800, 1900 MHz UMTS: 850, 1900, 2100 MHz HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 1000mAh which in a Usage time frame means 12 solid hours of streaming as well it has a Standby time of up to 576 hours 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 HARDWARE SPECKS: 2.4-inch TFT Display; Full Physical QWERTY Keyboard 2 Megapixel Camera (1600 x 1200 pixels) + Video Music Player & Video Player; Bluetooth: v2.1, A2DP, USB: microUSB v2.0, GPS: with A-GPS (No Wi-Fi), microSD Slot Expandable up to 32GB