The PS3 can pair with bluetooth keyboards and mice. As can PCs obviously. But for PCs you can use other programs on the client machine to make mouse/kb control work. You can't do this on the PS3 so you need an actual bluetooth connection. However, there are no apps I know that can do this, I wondered if maybe it somehow required root, and if there are any root-using apps that can turn the phone into a bluetooth input mouse/kb device to be paired with a ps3.