Reverse Phone lookups can be pretty handy but usually a service that performs the looks is pretty expensive.
There’s plenty of situation where I wished I could do a Reverse Cell Phone Lookup since most phones can easily hide their own number when calling you.
This can be incredibly annoying. Another great use for a service like Who’s Number Is That.com, is to rid yourself from annoying telemarketers.
Also check out the No Call List Information on their site.