Checking Phone Numbers

[Kevin Murphy <php@xxxxxxxxxxxxxxxxxx>]

I collect phone numbers via a web form that breaks the phone number  
up into 3 parts (3-digit area, 3-digit prefix, etc). Occasionally, I  
am having people put in a phone number such as 999-999-9999 or  
000-000-0000 or other numbers that are all the same. How would I go  
about comparing those three fields to see if they are all the same  
numbers. I can't just exclude it anytime that the numbers all match,  
for example 444 is a valid area code. It should only fail if all the  
numbers are exactly the same.

All the processes I've come up with seem to be rather convoluted. Is  
there a simple way to test for this?

--
Kevin Murphy
Webmaster: Information and Marketing Services
Western Nevada College
www.wnc.edu
775-445-3326