picoBrothers Sonic Grenade v1.0.4 S60v5/S^3 SymbianOS9.x Signed.
Sonic Grenade is an app aimed for crowd control and playing pranks on friends.
Read the instructions before using.
Connect the phone to a stereo and turn up the volume. The app generates a very high frequency sound that is really annoying and headache producing.
You can use the application standalone.
Hide the phone somewhere and play a prank on someone.