My wife has a BACKFLIP. For whatever reason, when she's on a call she often pulls the phone away from her face. The phone then displays the keypad along with the hangup button, and of course when she puts the phone back to her face it hangs up. Any suggestions about how to fix this, aside from re-training my wife how to use a phone? Maybe an app that puts more of a delay on the proximity sensor, or an alternate way to hang up the phone or something?