[355Nation]

Hmmm...that is an odd one, afraid I can't help, but can only add my "odd vibration" story. When I have the sms application open and have sent a text message, if I leave my phone in that "chat" and receive a message from the contact who I just sent one to, my phone will play the text tone and vibrate. I can turn the screen off, or leave it on, either way the phone does this. I've unchecked all the vibrate options, and, it will do this regardless of what profile the phone is set to.