I have been receiving disturbing phone messages left on my answering machine on my cell phone .and it says its from a blocked number so I can't call it back... what can I do to find out who it is?

Have you tried contacting your carrier to see if they can help?

They just said to change my number.. So I guess I need to do that:(

Yeah. If the number's blocked, then I don't think there's much you can do about it.

Changing your number is a good opportunity to weed out the unwanted contacts. Just give your number to people you want to have it.