The Silent Ringtone
When your mobile phone rings you may not want anyone else to know about it. What you need is a silent ringtone.
Download a silent ringtone as either an MP3 file or a WAV file if you want your cell phone to ring without a sound. With a silent ringtone your phone will ring but no one else can hear it.
Configure your phone to vibrate when a call or text comes in as well as use the silent ringtone. You can feel it; no one else can hear it. A small way to hide in a crowd.
Try the Mosquito Ringtone too.