Kyocera DuraXE 4G LTE Rugged Mobile Flip-phone Unlocked for GSM Networks DOES THIS DEVICE NEED A SIM CARD: Yes. Being that this device is an AT&T Branded device and on this sale you are purchasing outright the hardware without any contracts or obligations to any specific network it does NOT come including the sim card, Though it will work with any active GSM Sim card (Nano size SIM Card smallest type). The sim card does NOT come included and you will need to contact your Network Provider to acquire your Sim card (Free from most Carriers with activating an account). WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: well this device will support 12 different frequencies and here is the breakdown on LTE: B1 (2100) B2 (1900 PCS) B4 (1700/2100 AWS 1) B5 (850) B8 (900 GSM) B12 (700 ac). UMTS GSM: 850/900/1800/1900/2100. This device is unlocked and it works with any GSM network only phone calls will function out-of-the-box. For data and picture messages to work you'll need to update the APN settings which you may do by contacting your network provider. HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 1500 mAh which in a Usage time frame means 9.4 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 384 hours before you need to recharge the battery (Taken from the manufacturer so take with a grain of salt). TELL ME SOME HARDWARE SPECKS: Well this solid Rugged phone packs some serious hardware for starters it has a 1.1 GHz Qualcomm Snapdragon 210 MSM8909 quad-core Processor and with Built-in Storage of 8 GB (4.3 GB available to user) Plus an Expandable Slot (up to 32 GB) for additional storage as well it has a 2.6 in Display and a 5MP camera as well as Wi-Fi and Bluetooth to State a few this piece of solid Hardware in the rugged format. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WILL NOT WORK ON VERIZON OR SPRINT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!