Pantech Breeze 3 Basic Flip Phone (AT&T) DOES THIS DEVICE NEED A SIM CARD: Yes it does, Since the device is AT&T Branded it will work with any AT&T Standard size SIM Card (the Larges size Sim card Made) The sim card does not come included and you will need to contact AT&T to acquire your Sim card WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: GSM / HSPA 2G bandsGSM 850 / 900 / 1800 / 1900 3G bandsHSDPA 850 / 1900 SpeedHSPA 3.6/0.384 Mbps HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 920mAh which in a Usage time frame means 5 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 336 hours before you need to recharge the battery What if I'd like to use this device on a different network other than AT&T: You may contact AT&T after 6 Months of Using the cell phone or you may contact the seller even within this time-frame and and provide them with your IMEI they will provide you the unlock code Once this device is unlocked it will only work on GSM networks as AT&T or T-Mobile this device will never be compatible to be used with networks such as Verizon or Sprint.