Is there an app that will place a notification on the display reminding you that your iphone is in silent/vibrate mode?
My switch is hidden under my Otterbox flap. It's easy to forget it was put on silent. I have my phone set to vibrate also because I'll turn down the volume on apps and then my ringer is off.No, but theres pretty big switch on the phone, which indicates on or off for silent mode. It's on the left hand side of your phone and is the best indicator I know of.