The T-Mobile Sonic 2.0 Mobile HotSpot LTE will be released March 27, according to TmoNews. The mobile hotspot will be the first one to be sold by T-Mobile with a 4G LTE radio built-in. Pricing for the device has not been revealed. 

T-Mobile is joining the 4G LTE party later than its bigger rivals— Verizon, AT&T and Sprint — but is hoping once it does, devices on the network like the Sonic 2.0 Mobile HotSpot LTE will give it an out of the box advantage. T-Mobile isn't the first carrier in the U.S. to begin selling devices with 4G LTE radios built in before its 4G LTE network is fully up and running.

Sprint was the first U.S. carrier to offer a 4G network and it chose to use a wireless technology called WiMAX to power its 4G devices. The first 4G smartphone Sprint offered was the HTC Evo 4G in March 2010. The technology allowed devices to use both Sprint's 3G CDMA EV-DO network and its new 4G WiMAX network. The technology never saw mainstream adoption and Sprint watched Verizon and AT&T choose the LTE technology that was quickly becoming the 4G standard. Sprint decided to abandon WiMAX and announced it would begin building its own 4G LTE network at CES 2012. The first smartphone Sprint shipped with 4G LTE support was the Galaxy Nexus and it released the smartphone in April 2012, although its 4G LTE network was and is still very much in its infancy.

A 4G LTE network is only as good as the hardware that supports it. So it makes sense that T-Mobile would want to have as many 4G LTE- enabled devices available at launch.