Coolpad Rogue 4G (Simply Prepaid T-Mobile) Silver DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is T-Mobile phone it will work on any T-Mobile Prepaid account with a Micro size SIM Card The sim card does not come included and you will need to contact your Network Provider to acquire your complimentary Sim card (Free from most Carriers with activating of an account) The Phone size is 4.88 x 2.52 x 0.49 inches and runs OS Android 5.1 Lollipop has a 2 MP Rear Facing Camera and a .3 MP Front-facing Selfy camera, Dual-core Qualcomm Snapdragon Processor Running at 1100 MHz, and includes 4GB of memory (Expandable up to 32GB) and 1GB of ram HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 1600mAh which in a Usage time frame means 8.33 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 144 hours before you need to recharge the battery WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: GSM: 850, 900, 1800, 1900 MHz UMTS: 850, 1700/2100, 1900 MHz Data: LTE, HSPA, HSUPA. With T-Mobile simply prepaid unlimited data plans starting at $40 consider this a cheap burner phone or a backup option you definitely get your bang for your buck on this one.