Posted July 13, 201212 yr comment_46044 This app helps anyone to get out of that place by producing very high frequency sound! Sonic Grenade is an app aimed for crowd control and playing pranks on friends. Disclaimer: 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. Download it at Nokia Store
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