Doesn't work for me either.

At least yet...
Then again, 95% of the time I call UA, it's from my office, where I could be calling from one of 15-20 different phone numbers. Same phone numbers that the company's 3 Premiers, 1 Premier Exec and this 1K would be calling from as well.
Probably would be different from home, but again, I rarely call from home.