Does not work on At&t Cricket H2O. 1. Insert Standar Sim Card (4G lte Hotspot Service Required ) 2. Conect Modem to USB Port. 3. Install Huawei Mobile Software 4. Wait 3-5 Minutes. This feature-rich 4G broadband modem can connect your laptop or desktop computer to 4G LTE wireless network, up to 10X faster than 3G. You can receive text messages, The easy pop-out USB connector works with different USB locations in your PC, offers you convenience, speed and power, all of which you're sure to appreciate. Specifications 4G LTE band 4/13 700/1700/2100 MHz 3G CDMA 900/1900 MHz Card modul: removable SIM/USIM 4G LTE Downstream 100Mbps Upstream 50 Mbps 3G Downstream 42 Mbps Upstream 5.76 Mbps Antenna: Internal External antenna connector Chipset: MDM9600 RAM: 64MB / 128MB (Flash) MMC Slot: MicroSD up to 32 GB support OS Supported Windows XP, 7, Mac 10.6 up Dimensions: 3.62 x 1.37 x 0.59 Inches Weight: 1.76 oz