Sony's Xperia SP smartphone will be able to sync with the PlayStation 3's DualShock 3 controller, allowing you to ditch the onscreen gamepad in compatible PlayStation Mobile games. The DualShock 3 connects to the Xperia SP via Bluetooth.
The DualShock 3 should work with any games that support a USB gamepad. Finally, an excuse to bring a smartphone and a full-size DualShock 3 on the bus.
Sony PlayStation 3 (late 2012)
Sony Xperia SP