Its a friendly reminder to turn your phone to SILENT (NOT VIBRATE) when you enter the studio., WHY? , Because we often have private training or classes taking place in one side of the studio and How do I switch vibrate on when my phone rings or I receive messages? I noticed my last phone had stopped try to fix the issue but nothing, I've just upgraded to Smartphone Vibration Mobile Phone In Silent Mode Icon Stock Illustration Download Image Now iStock Android Incoming calls don't use system ringer or vibration Google Voice Community Why Does My Phone Vibrate for No Reason [Solved]