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I'm building a reverse phone number look up site.
All the phone numbers that are in existence and all that can be in existence each area code would have an index page and that would lead to a prefix page and then the last 4 digits after that. So what ever phone number someone punches in to a search I'll have it in my site for instance who called me from 503-826-2452 I would have that on my site with a link. This should be possible with php.
Let me know if you need more detail.