I wrote to HTC about this issue.....in "Accessibility" you have an option to end phone call with hard press power button.....what HTC fails is: while on a phone call (e.g., long waiting hold) the screen went to sleep "black blank space" and to wake up phone one must and ONLY push on the power button....this will wake up phone but also "end your phone call"...there is no option to wake up phone while on a call if your phone turn blank.....any one has another suggestion to do this without using the power button?