Checked with them about what specifically?
I know the number is 1416 (it works) but the stock dialer app being unable to save the number doesn't sound like a carrier issue to me.
Not being sarcastic, just not sure what you think I should check on with them.
Edit: I'm OP
I haven't found a solution to this, but you might follow the thread at http://www.droidforums.net/forum/htc-rezound-help/207082-more-gmail-problems.html