|Adding sound to your games|
If you wanted some sound effects while playing the games provided in your Ericsson, simply key in the command *335* from your standby screen. You will get the message "INVALID SERVICE CODE. PLEASE RE-ENTER. THANK YOU" which is different from the usual "Network Problem" respond usually displayed when an invalid GSM code is given.
Now everytime you start a game, it'll have some sound effects to it. Be aware that this does reduce your battery's life somewhat.
How do you switch off the sound effects? Simply switch off your mobile and the next time you switch it back on, it'll go back to being mute.
Note: This has been confirmed to work on a T29s phone. Did not work on my R320s though.