The Sierra Wireless 598U USB Modem for Sprint offers excellent on-the-go Internet access for a great price. This device's support for Sprint's EV-DO Rev A 3G network means you'll enjoy fast data transmission speeds (up to 3.1 Mbps download, and 1.8 Mbps upload). The 598U USB Modem for Sprint lets you use your computer to surf the Internet, send and receive email and connect to corporate networks from just about anywhere. Finally, the 598U has a microSD slot that support cards up to 32 GB