DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is GSM unlocked it will work on any GSM Network 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) WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: Well this device supports 4 types of Technology GSM / CDMA / HSPA / LTE. on the LTE network it will support Bands 2,4,5,12,13,17,25. on the 3G Network it will support HSDPA 850 / 1700(AWS) / 1900 / 2100 and on the CDMA Network it will support CDMA 800 / 1900 and on the 2G Network it will support GSM 850 / 900 / 1800 / 1900. Bands 1, 3, and 7 give it the ability to roam on LTE in many foreign countries, including most countries worldwide. HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 2800mAh which in a Usage time frame means 20 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 400 hours before you need to recharge the battery