The Phone Archive says it searches USA based phone numbers usages and context snippets on webpages and documents found on the Web. This is operated by the same folks that run The Email Archive that I found less that useful earlier this week. This site is much more useful.
While they advertise this as searching US based phone numbers I found it useful for finding references to any phone number in the NA numbering plan. I found numbers in Canadian, Panama, and Caribbean islands.
I haven’t compared results to the large search engines, but this is a useful resource.