if my screen is timed out and i get a call, it often doesnt bring up the caller ID/swipe to answer or decline screen. it stays black and then i have to press the button on top to wake it up, then draw my unlock pattern. if i miss the pattern once or twice i might miss the call.
also, whe youre on a call, as you know, the screen goes dark. on my device it does more than go dark, it locks. so to end a call that wasnt picked up i have to wake it, then draw my unlock pattern, then end the call. at which point it may have gone to VM and thats annoying for the people I call.
i hope that explains it better...