The Federal Communications Commission has finally approved the first 4G Long Term Evolution (LTE) phone for sale in the US. Though the first LTE handset will be available through MetroPCS, the FCC has now opened the door for other LTE devices, including those for Verizon's in-testing LTE network.

The Samsung SCH-r900 will be the first LTE phone to market in the US, which MetroPCS hopes to launch "this summer" according to InformationWeek. We're still mostly in the dark as to where MetroPCS plans to build out its LTE network (the company said earlier this year that it was targeting a number of metro markets, but only named Las Vegas), but regardless, it looks like Sprint will soon have to share the 4G limelight.

One company that has been keeping the world slightly more up-to-date with its LTE buildout plans is Verizon. The carrier is already testing its network in Seattle and Boston, with around 30 more markets expected by the end of the year. Those markets, according to rumors from Engadget, include a number of airports, Chicago, Los Angeles, New York, and Philadelphia.

Verizon apparently plans to make its first commercially available LTE devices laptop data cards, but the question many have been asking is whether Verizon's LTE rollout could hail the launch of the Verizon iPhone. In addition to rampant rumors of a possible January release, Ars has heard from someone in the know that Verizon is already testing an LTE iPhone in Boston and that the official launch is dependent upon the mass expansion of the carrier's 4G network. We hear an announcement could come as soon as September (a month when Apple traditionally holds an event to introduce new iPods), but we're still filing this one in the rumor category.

If you're looking for a primer on LTE technology, check out our recent feature on the state of 4G.