Thanks to Verizon's blowout at CES, we've already been treated to a couple of LTE-friendly mobile hotspots from the likes of Samsung and Novatel Wireless, but Sierra Wireless is joining the crowd here at Mobile World Congress. The outfit has just revealed its two newest mobile hotpots, the AirCard 754S and 753S. The former supports dual-carrier LTE, while the latter handles dual-carrier HSPA+, enabling up to five WiFi devices to surf on either of the fastest two mobile superhighways. We're told that the 753S can hit downlink rates as high as 42Mbps (and upload rates near 5.76Mbps) on a DC-HSPA+ network, while the 754S can reach 100Mbps (down) / 50Mbps (up) while operating on an LTE network. Both of these are right around the size of a deck of cards, and no software installation is required to get 'em working. There's also an integrated LCD that provides a look at WiFi access information, battery life, network signal strength, and the number of devices connected, with audible alerts and a web admin interface available as well. The duo is expected to ship at some point during 2011's second quarter, but there's no news yet on which (if any) carriers will be picking them up.

Moving right along, Canada's own Telus will be offering yet another new one from Sierra Wireless this March: the AirCard 319U USB modem, a device we recently spotted in the FCC's database. This one promises download speeds of up to 42Mbps and upload speeds approaching 5.76Mbps, with a swiveling design that allows the body of the modem to be tucked up against the side of the notebook and protects it from being damaged by accidental bumps. The LTE-friendly AirCard 320U is the USB version of the 754S hotspot shown above, with an articulating and pivoting hinge that works with the widest possible variety of USB port placements, and if all goes well, it'll ship during Q2 2011 for an undisclosed rate. Sierra plans on having Mac and PC support for the whole lot, and we'll be digging for details surrounding price and availability.
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Sierra Wireless AirCard 753S and 754S

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Sierra Wireless intros dual-carrier HSPA+ / LTE AirCard 753S and 754S, with 319U and 320U in tow