Features:  http://www.winghangpc.com/product.asp?id=439

>>| WORLDWIDE WIRELESS FOR THE WORLD WIDE WEB*
EDGE USB Modem WHPC-04 is a quad-band wide area wireless modem supporting all the different frequencies used by EDGE and GSM/GPRS networks worldwide. Users around the globe can enjoy the freedom to have access to critical information wherever they are located on both EDGE and GSM/GPRS networks.

WORLDWIDE USE WITH QUAD-BAND OPERATION
CAPABLE OF WIRELESS DATA SPEEDS UP TO 236.8 KBPS
LOW POWER CONSUMPTION EXTENDS BATTERY LIFE
DIAL-UP NETWORKING (DUN) MODES
RECEIVE SMS MESSAGES OR VOICE CALLS
ACCESSING E-MAIL AND BROWSING THE WEB

SIM CARD FUNCTIONALITY

 >>| QUAD-BAND EDGE/GPRS:
GSM 850 MHz band Transmit, Receive: 824-849MHz, 869-894MHz?
Output Power: 500 mW (+27 dBm) /2W (+33 dBm)

GSM 900 MHz band Transmit, Receive: 880-915MHz, 925-960MHz
Output Power: 500 mW (+27 dBm) /2W (+33 dBm)

DCS 1800 MHz band Transmit, Receive: 1710-1785MHz, 1805-1880MHz
Output Power: 400 mW (+26 dBm) /1000 mW (+30 dBm)

PCS 1900 MHz band Transmit, Receive: 1850-1910MHz, 1930-1990MHz
Output Power: 400 mW (+26 dBm) /1000 mW (+30 dBm)

>>|OPERATING SYSTEMS SUPPORT:
Windows 2000, NT,XP, Vista

>>| ADDITIONAL CONNECTIVITY SUPPORT*:
EDGE, GPRS, and GSM Circuit Switched Data
Support for Multiple APNs
SMS (send and receive)
Dial-up networking

Voice and fax support

>>| ENVIRONMENTAL:
Operating Temperature: -20 to +60 celsius degree
Storage Temperature: -30 to +85 celsius degree
Vibration (non-operating): 15g peak, 10 Hz to 2 kHz

Humidity: 95% (non-condensing)