HTC Tattoo :: Menu Key Unlocks Phone?

I don't know if this is a tattoo specific issue, or an android issue. When the phone is locked the "normal" way to unlock it is to slide down the screen with your finger, the problem is that it also unlocks just by pressing the menu key. No need to do anything else.A frequent situation: make a call, lock the phone, and put it inside a bag (hand bag). In this case it's extremely easy for the phone to call anyone in your list of recent calls. It's happened to me a few times already.The unlock procedure should be clear: you need to drag your finger down the screen.