Sierra Wireless has announced two new USB cellular modems, the AirCard 880U and 881U. Unlike most of their HSPA brethren, the pair is based on HSUPA technology, which in this case allows improved speeds of 7.2Mbps down and 2Mbps up. By contrast, most HSDPA connections are limited to 3.6Mbps down and 384Kbps up. The cards remain compatible with H
