Unlocked AT&T Novatel 2372 3G MiFi GSM Mobile Router Hotspot WiFi Unlocked for any GSM Global carrier in the operating frequencies, with a data activated Sim Card HSPA 850/1900/2100 MHz; EDGE/GPRS 850/900/1800/1900 MHz Operating System Support: Windows 2000, XP, Vista, 7; Mac OS X 10.4 or later, Linux Up to five users or devices can connect to MiFi 2372, making it the perfect companion on-the-go. Sim card is not included.