ATTENTION: Don't use any Reverse Phone Lookup services
Until you see these actual  'User Reviews'

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Reverse Phone Detective

ReversePhoneDetective.com is a website that allows you to quickly look up who owns a cell phone or landline number, particularly those numbers that belong to prank callers, all missed calls and other unidentified people.
It’s interface is easy to use and delivers results within seconds. It is currently the world's most used service online.
  

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Reverse Records

ReverseRecords.org markets itself as discreet and confidential appealing to those who may be concerned about others finding out about their search. Reverse phone look-up is only one of the options. The search includes names from a gigantic database of over 400 million records.

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Reverse Mobile 

ReverseMobile.com is a large database that allows you to access multiple data, including background reports, and associates with cell phone numbers. It provides 100% privacy if you are concerned others will find out you are looking up their information. They have a detailed Q & A area that answers most questions you will likely have.
 

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Cell Phone Registry Searches

CellPhoneRegistry.com allows you to use their massive, detailed database to locate friends, relatives, lost love, classmates or anyone else. In case you have other questions or concerns, it offers a sales and support number at (800) 764-0104 that can be difficult to find on other similar sites.

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Phone Number 411

PhoneNumber411.com goes a little further than the rest and covers North American numbers as well some of the  Caribbean Islands . It provides a detailed “Tips & Resources” area and “Privacy” outlines to address user concerns right away.

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Reverse Genie

ReverseGenie.com is a fully organized search database that gives you instant access to complete research tools like address reports and criminal records for a cell number. It also provides a “search history” feature that allows you to retrieve your past search results inside the member's area. Also delivers medical records, driving records, insurance records, and even employment history.
 

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USA Phone Lookup

USAPhoneLookup.com provides comprehensive, detailed background reports that include owner or business name and address, line type, carrier, phone company, and even access to local sex offenders database. It has a “No Hit, No Fee” refund policy.
 

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Phone Number Scan

PhoneNumberScan.com offers easy, reliable access to owner information, address history, carrier, and location details for any phone number. Database coverage includes cell, residential, business, pager, toll-free, and unlisted numbers. Their information is gathered from updated public records and magazine subscriptions, like many other sites.