This is what his explanation from Nextel is... Now mind you, I'm don't necessarily believe this, just putting it out there to work through it.

"She said just because you see the number on your bill does not always mean you made the call. That is why it is a good idea to review your bill monthly"

"THEY WILL REVIEW THE ACCOUNT FOR THE NEXT MONTH TO SEE IF ANYONE CALLS THAT NUMBER AGAIN. IF NOT SHE SAID THE IT COULD BE BATCHING( WHEN CALLS APPEAR ON YOUR PHONE BILL THAT WERE NOT MADE FROM YOUR PHONE). SHE ALSO SAID THAT SOMEONE COULD HAVE A SIMILAR NUMBER ,AND THE NUMBERS GOT MIXED UP."

I think he is trying to take me away from the problem at hand, and get me focusing on how we could possibly be charged for calls we didnt'make.

I did find out the number is a local number through a CLEC. Which is a local competitive carrier.