Samsung today unveiled what is possibly the first phone supporting the upcoming, fast LTE network. Samsung Mobile has really taken advantage of their floor time at the CTIA wireless show in Las Vegas. Following the release of the Wave S8500 and the Galaxy S, the company introduced the second 4G phone to debut at the show. The SCH-r900 won’t run on the WiMAX network that Sprint and Clearwire use; instead, it will run on the LTE network that is still at least 7 or 8 months away from being initialized.
When it comes to 4G phones, Samsung won’t be the first as HTC will be shipping their HTC Evo 4G this summer way ahead of the SCH-r900. However, LTE is supposed to be much faster than the Evo’s WiMax, with speeds of upto 100MBps vs. speeds of 10Mbps for WiMax.
MetroPCS plans to initially deploy a commercial LTE network in various metropolitan markets, including the Las Vegas metropolitan area where Samsung Mobile LTE network products will be used, in the second half of 2010. We can only assume that the phone will be launched on other carriers as well, but obviously no one else is called dibs just yet.

[source]