Unlocked ZTE MF636 3G GSM USB HSDPA 7.2 Mbps DL Aircard Modem Unlocked for any Global GSM Carrier, with a data activated SIM Card, service from a Network Carrier is required HSDPA/HSUPA/UMTS 850/1900/2100 MHz GSM/GPRS/EDGE 850/900/1800/1900 MHz HSDPA DL 7.2Mbps HSUPA UL 2Mbps Modem is branded for a carrier but it is fully unlocked Zero-Install Plug and Play Software (No CD required) for Windows 2000, XP, Vista, Windows 7 or Mac OS X 10.4 and above Up to 4GB of memory storage capability with a MicroSD card (SD Card and Sim card are not included)