If you're just needing GSM/GPRS, check out the Samba 56 Tri Band USB Modem
This compact USB modem adapter allows you to get a wireless data connection any place you have cell phone reception. Supporting GSM/GPRS data, this adapter has world-wide compatibility so it's great for travelers. Simply insert your SIM card and plug it into an available
USB port and you will be surfing the web and checking your email anywhere.
This adapter supports GPRS multishot class 10 and supports the GPRS coding schemes CS-1, CS-2, CS-3, and CS-4. Voice, SMS, and FAX are all supported - there are even seven ring tones included for customization. The SAMBA modem can be easily controlled using AT commands for a wide variety of applications.
The Samba 56 supports GSM operation at 900/1800/1900 MHz.