Unlocked Huawei E303 HSPA+ 3G GSM USB Wireless Mobile Broadband Modem Unlocked for any Global GSM Carrier, in the operating frequencies with a data broadband activated SIM Card 3G HSPA/HSUPA/HSDPA/HSPA/UMTS/WCDMA 850/2100MHz 2G GSM/GPRS/EDGE 850/900/1800/1900MHz Data and SMS service. Micro SD Memory Card Slot Supported Systems Windows XP, Windows Vista SP1/SP2, Windows 7, Linux, Mac OS X 10.5 and 10.6 with latest upgrades Sim card or Micro SD card not included