Sony Ericsson passed its txt pro CK15a entry-level smartphone through the FCC today.  The device sports a sliding landscape QWERTY keypad and runs a proprietary Sony Ericsson OS.  As its name suggests, the txt pro is messaging centric, and features Gmail, Google Talk, Twitter, Facebook and txt apps.  Other features include a 3-inch screen with a 400 x 240 resolution, 64MB of RAM, up to 100MB of internal storage, microSD card support up to 32GB, a 3.2MP camera and up to 400 hours of standby time.

No word on pricing or availability, but today’s FCC filing is a good sign that we’ll be seeing the txt pro soon.  The device supports AT&T and T-Mobile bands in the US.