When the popular 800 numbers became scarce, the FCC introduced the 888 and 877 numbers in the mid-1990s and the 866 pre-fix in 2000. Available stock of toll free numbers is quickly depleting and industry insiders are awaiting the release of the 855 numbers currently reserved by the FCC. Insiders say these numbers may not be released for several years.
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Toll Free Service Management System News 
very informational. thanks for the post.