When the phones just sitting there I can push the pwr/unlock button 3 times and the "Screen locked' Slide Up to Unlock comes up and works.
However, when the "receive call" or the "battery fully charged" popup is on the screen I can't get the screen to unlock. I can eventually get to the "Screen Locked" view, but the "Slide up to Unlock" is frozen.
I currently have the Auto screen lock set to OFF. It still locks after about a minute. The backlight is set at 30 seconds. If I push the volume button the screen lights, but is locked no matter what the Auto Screen Lock setting.
I've done a master reset of the phone settings. No love.
No screen protector or case.
The "Send", "Back" and "End" keys are also locked.
Today mine wouldn't unlock when I wasn't receiving a call. Just wanted to unlock it. I was so weird. I think I hit the power button once or twice and then it unlocked. I hope both of ours are just a glitch. Try powering down the phone. Wait and then power up again. Sometimes that fixes problems. good luck!