App for case cover

[420benz]

I have a phone case with a hinged screen cover. Is there a setting or App to put phone in sleep mode when closed and wake up when opened.

 

[B. Diddy]

Many cases have a tiny magnet embedded in the cover that activates the phone's smartcover sensor--but it sounds like your case doesn't. In that situation, you can use an app like Auto Screen On Off, which uses the proximity sensor instead.