T-Mobile USA has announced that it will offer the G2x smartphone by LG online starting April 15 and in stores on April 20.

The phone will be priced at $199.99 with a new two-year service agreement, or $499.99 full retail.

The G2x is a variant of LG’s Optimus 2x that had been previously announced, and which we reviewed earlier this year.

The T-Mobile G2x offers a 4-inch touchscreen and is powered by an NVIDIA Tegra 2 dual-core processor and runs Google’s Android 2.2 Froyo operating system. The device has a built-in 8mp rear facing camera as well as user-facing 1.3mp camera for video chatting.