The Sierra Aircard 250U is the latest dual-mode 3G/4G USB modem to hit the market and the first from Sierra Wireless. CLEAR released their version of the 250U - which they call the "Series S 4G+" modem - in three test markets in June and will make it available to all customers in July, and Sprint announced that their version of the modem will launch nationwide in July as well.
The 250U is not the first 3G/4G-capable device, but it is the first to feature something potential users have been hoping for since the very first 3G/4G device: an antenna port for improving cellular signal. The 250U actually features two antenna ports: one for a 3G antenna, and one for a 4G antenna (which aren't yet available, but will be in the future). This really sets the 250U apart from its predecessors and makes it more accessible to a lot more potential users - mobile broadband users who rely on antennas to get a reliable signal for their 3G aircards have been hesitant to make the move to a 3G/4G device, but now users don't have to sacrifice the ability to easily boost 3G signal in order to get a 3G/4G modem!
Read our full review of the 250U on EVDOinfo.com: Sierra Aircard 250U 3G/4G USB Modem Review