Sierra Wireless USBConnect Momentum Global 4G LTE USB Modem - AT&T The Sierra Wireless AirCard 313U is one of Sierra Wireless's first in a family of USB stick modems for 4G LTE networks offering download speeds of up to 100 Mbps and upload speeds up to 50 Mbps With peak data speeds of up to 42Mbps on the downlink and 5.76 Mbps on the uplink. This technology has been realese in many countries around the world as Telstra NextG Australia, Telus & Bell North America, Turkcell Turkey, Telus Canada and many countries!