google my friend there are a number of games free on the scummvm website, you just download, unzip and then copy over to ur phone to a folder of your choice, start scummvm and point to the folder, it will find the files and list the game, bbosch u can start playing.

A few good ones that arent for free include

Sam n Max (hit the road)
Day of the Tentacle
The Dig
full Throttle