Sprint announced Tuesday that it plans to sell the LG Mach smartphone with 4G LTE this fall, adding a second slider-style smartphone with a physical Qwerty keyboard. The other is the Motorola Photon Q, also with LTE, which sells for $199 with a two-year Sprint contract.

Sprint is selling the LG Mach smartphone with LTE service and a physical keyboard for $100.

The Mach will probably sell for about $100, in the mid-price range, said David Owens, vice president of product at Sprint, in an interview.

While is promoting its 5 as a taller smartphone that can be used with one hand, Sprint says there is plenty of demand still for a two-handed texting device with a physical keyboard.

"People actually like the comfort of a physical keyboard, and say there are fewer errors. They want a two-handed device," Owen said, explaining why Sprint sells devices with the physical keyboard as opposed to a touchscreen.