Huawei E1556 Unlocked GSM Modem 3G USB HSDPA Mobile Broadband Unlocked for any Global GSM Carrier that operates in the frequencies supported for this Modem, with a data activated SIM Card HSUPA/HSDPA/UMTS: 2100/1900/850 MHz. EDGE/GSM/GPRS 850/900/1800/1900MHz Data and SMS. Interface: USB 2.0 480Mbps interface Micro SD Card Slot - Card Not Included. SIM card not included. Support OS: Widows 2000, XP, Vista, Widows 7, 32bits/64Bits, Mac and Linux