Why do people call numbers that they don't know, but are 'on their phones'? I mean, if you get a number you don't recognise on your "missed calls", why call it back? If it's important, surely the caller will call again, or will have left a message.
Don't do it you sad muppets with a pathetically small excuse for a life. You're not popular, you're not important, you're really just a flid who shouldn't be allowed a phone in the first place. Get a life, and some friends you dipstick.