Kyocera DuraXE E4710, Black 8GB (AT&T) DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is AT&T it will work with any active AT&T Nano size SIM Card (smallest type) The sim card does not come included and you will need to contact AT&T to acquire your complimentary Sim card (Free from AT&T with activating of 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. So many bands give it the ability to roam on LTE in many foreign countries, including all of Europe and much of Asia. 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. 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. As well this device comes with a solid loudspeaker and speakerphone for those hectic conditions besides for waterproof and dustproof to military Standers you could take this anywhere you go without the need to worry.