3. The Reverse Cell Phone Number Lookup by Private Eye: Sure, you could hire a private investigator to scour all available resources for the cell phone information you seek. But there are several downsides to this method. For one, it's expensive. For another, you have no control over the speed at which the information is retrieved and delivered. Both of these are prices too high to pay for work that you can very easily, and quickly, do for yourself.
   
   
4. The Reverse Cell Phone Number Lookup by Reverse Cell Phone Number Lookup Service: These are online services to whom you pay a small one-time fee for the privilege of searching its databases an unlimited number of times. Of the four methods listed, this is assuredly the most reliable and effective of the bunch, while keeping control over the search fully in your hands.

If an unidentified caller had contacted you from a landline, you could simply lookup their information in the local phone book for the area code where the caller's phone service originates. But no such phone book (online or off) exists for calls made from cell phones. And that is why a reverse cell phone number lookup by paid reverse cell phone lookup or directory is a resource well worth the small one-time fee you'd pay for the service.