I have found an app that  has changed my life.. Shush! Ringer Restorer – despite the somewhat corny language it uses.. it has become the one app that is used most frequently.

I have been bad at disabling the silent or vibrate mode on my phone, annoying friends and family by being unreachable.. so now each time you set your phone to vibrate the app will ask you when to switch it back on..! Simple and effective and a remarkable 4,7 star rating. Shush! Ringer Restorer- screenshot

It should be built in to every smartphone with quick access functionality, and integrated into the “Do not disturb” (DND) functionality introduced in Android 5.1.