Checking Phone Numbers

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