This is not true. If you put in an invalid number you get booted into the regular queue. It doesn't tell you that this happens, but many have experienced it.

I'm on the side of a single number in perpetuity. I don't care if CO has to eat the cost of all the numbers they've previously purchased. They already paid the initial cost for them. It would actually probably same them money as they could release the othhers back to the TelCo and not pay to maintain them for the next many years. AA, DL, US, UA all have a consistent number year over year. Way back in the day I'd call in on the DL special member services number and they'd either kick me out or not, but it worked most of the time. Sure, I wasn't elite, but I could get by with my dad's account most of the time. Now that it can be (and is) easily filtered at the initial data entry point of the call there is no reason to change the numbers. Pick one number and stick with it. Change the first digit to something other than a 2 if you don't want to confuse people. But pick a number and stick with it.

S.