Asus Zenfone 2E 5" Smartphone 4G LTE 8GB 8MP GSM Unlocked 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: Bands 1, 2, 3, 4, 5, 7 and 17 and UMTS B1(2100) B5(850) B8(900) as well as Standard GSM 900(E-GSM) and 1800(DCS). LTE Bands 3, 5, 7, give it the ability to roam on LTE in many foreign countries, including all of Europe and much of Asia with coverage on 66% of LTE Networks Worldwide. HOW LONG CAN I EXPECT THE BATTERY TO LAST ME: Well the battery has 2500mAh which in a Usage time frame means 19 solid hours of streaming at 4G LTE speeds as well it has a Standby time of up to 54 hours before you need to recharge the battery. TELL ME SOME HARDWARE SPECIFICATIONS: Well this device runs OS Android 5.0 (Lollipop) Qualcomm Snapdragon 800 2.3GHz quad-core processor this device was released in July of 2015 and this sale will include a no contract no network commitment as the phone will work on any GSM network Worldwide WHAT DOES UNLOCKED REALLY MEAN: Unlocked devices are compatible with GSM carriers the kinds that Use SIM Cards for Service like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers) Unlocked Devices will not work with CDMA Carriers the kinds that dont use sim cards for service like Sprint, Verizon, Boost or Virgin (contact your network provider prior to purchasing for verification that they support GSM frequencies).