Netgear Unite 4G LTE Mobile WiFi Hotspot - (AT&T) White DOES THIS DEVICE NEED A SIM CARD: Yes it does Being that this device is AT&T Locked it will work only with an active AT&T Standard size SIM Card 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 activation of an account) WHAT NETWORK FREQUENCIES ARE SUPPORTED BY THIS DEVICE: This device will support B17 (700) and B4 (1700/2100) on the 4G Spectrum. and B5 (850), and B2 (1900) on the 3G Spectrum. Please note this will only support AT&T spectrum and will not support any other networks frequencies as this device comes restricted to be used only on the AT&T network WELL, HOW LONG CAN IT LAST ME: A removable Netgear Cadex Tested W-5 2,500mAh battery that lasts for 18 hours, 8 minutes of continuous streaming in our tests. That's more than three times what most smartphones typically manage to stand out in hotspot mode. WHAT IS A MOBILE WIFI HOTSPOT: Mobile WiFi hotspot can (once activated by AT&T) provide mobile Internet on the Go for up to 10 WiFi compatible devices at 4G LTE Speeds on the AT&T Network. the Hotspot will be Locked to the AT&T Network for at least the first 6 months (Contact AT&T for assistance with Unlocking this Device). WHAT CAN I EXPECT WITH THE PURCHASE OF THIS DEVICE: Well when purchasing this device you are acquiring the hardware needed to receive service the hardware is guaranteed to function to manufacturer's specifications for all Hardware related concerns feel free to reach out to your vendor you purchase the device from and for all network-related assistance feel free to reach out to AT&T as they will be best to assist in that regard.