I just discovered this yesterday and maybe others knew it and I'm just catching up but here's what I found- If you miss a phone call with your phone and the number shows up in your "Missed calls" display and you don't recognize who it was- You can type it into the search box in Address Book and it will find it. Assuming it's one of your contacts. Heips us old geezers who don't remember things like phone numbers

Or type it in to Google if it's not an unlisted number but not in your address book.

Great tips, thanks!