Please help. My wife got herself a new phone and gifted her old htc desire hd to our son. She deleted avast thinking this would delete the stealth app, and it wasn't until she put in my sons sim and phone locked that she realised it hadn't. She has forgotten her pass code, for entering when alarm starts, and phone won't stay unlocked long enough to allow me to delete stealth app on start up. She has inserted her old sim, but phone still locks even with that. Please help as son now has no phone.