Kyocera Hydro Wave C-6740 4G LTE Smartphone (Simply Prepaid T-Mobile) DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is T-Mobile Branded Phone it will work with the enclosed micro size SIM Card The sim card comes included. WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: This device will support 850, 900, 1800, 1900 MHz UMTS: 850, 900, 1700/2100 MHz HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 4340mAh which in a Usage time frame means 18 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 600 hours before you need to recharge the battery. HARDWARE SPECKS: System chip: Qualcomm Snapdragon 410 8916 Processor: Quad-core, 1200 MHz, ARM Cortex-A53, 64-bitGraphics processor: Adreno 306 System memory: 1 GB RAM Built-in storage: 8 GB Maximum User Storage: 4 GB Storage expansion: Up to 32 GB THIS PHONE WILL ONLY WORK ON THE T-MOBILE NETWORK AS IT IS APP LOCKED. As well T-Mobile will not unlock the device until completion of service with T-Mobile for 2 years