What was that phone number that just called, didn’t leave a message and you didn’t recognize it? If you are not sure, you should first cross-check it with 1-800-notes. The socially moderated site allows you to lookup the number and then review comments from other users who generally reveal who is calling. You can also of course add your experience about the number as well. The next time you get a call and you aren’t sure who’s on the other end, first try this website.