> Every payphone has a unique phone number. When you call (888) 683-6697, I see the number you're calling from and match it in my database.

Has anybody tried to win by spoofing the caller ID? For science, of course.

I think it's harder to spoof toll free numbers. For example, you can't block caller ID in the same way. I'm sure it's still possible to spoof, but just might be a little harder.