my droid is "frozen" in the call mode. it won't let me end the call on the touch screen or by hitting the red end call button. it's status is "dialing" but have a notification of an ongoing current call. my screen isn't frozen b/c i can move around to different apps/functions, but can't check email, fb, or make other calls b/c this call is still active. how do i unfreeze the end call function?