ZTE Altair 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, 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 following Technology GSM: 850 900 1800 1900 MHz UMTS: 850 1900 2100 MHz Please contact your network Provider and inquer if they support these bands in your area to ensure the device will work Properly. HARDWARE SPECKS: Well the battery has 1000mAh which in a Usage time frame means 4 h 30 min talk time as well it has a Standby time of up to 216 hours before you need to recharge the battery (Taken from the manufacturer so take with a grain of salt). 2.4-inch screen and full QWERTY keyboard 256MB of ROM, 128MB of RAM, and Bluetooth 2.1. 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). ONLY GSM NOT GOOD FOR VERIZON OR SPRINT OR ANY CDMA NETWORK CALL YOUR NETWORK PROVIDER PRIOR TO PURCHASE TO INSURE THEY WILL SUPPORT THE FREQUENCIES LISTED IN THE 2ND BULLET POINT