USBConnect 881 is like a PC card in USB form. Setting it up is simple. For Windows users, you need to use AT&T’s Communication manager. Mac users, on the other hand, can use the bundled Sierra Watcher Utility. Additionally, the USBConnect has a built-in signal-boosting battery. However, it is still a little bit bulky than Verizon and Sprint cards. It can use AT&T’s HSUPA (High-Speed Uplink Packet Access) once it goes live in the next few months. However, keep in mind that AT&T’s known weakness is its limited coverage of some cities. Despite that, Sierra Wireless’ USBConnect 881 has no compatibility issues. If you’re looking for the device with the best possible upload speeds, the reviewer notes that the 881 is a good choice.