One way to conduct a reverse lookup for 877 numbers is to use an online reverse cellphone finder, such as SpyDialer.com, ReversePhoneLookup.com, PeopleSmart.com and WhitePages.com, as of July 2015. In addition to toll-free numbers, these online lookup services work with ordinary phone numbers.
To look up a phone number on WhitePages.com, select the Phone option at the home page, enter the phone number in the field provided, and then click the Search button. If the phone number is valid, the result page displays information such as the carrier of the line and location of the owner.
For SpyDialer.com, enter the phone number in the field on the home page, click Search, select a lookup, and click the Search button again. If the phone number is valid, the result page displays the name and general location of the possible owner. SpyDialer works for both cellphones and landlines.
The lookup procedure for ReversePhoneLookup.com and PeopleSmart.com is similar to that of WhitePages.com. However, PeopleSmart requires you to submit your name and email address to view the results. Premium PeopleSmart members have access to more information, such as employment details, birth records and court records. These members also receive alerts whenever the site updates information concerning saved searches.