Hey Strathcom - That is strange as they did stop with texts and phone calls because of folks gaming the system. The only way to do it was through a postcard.
But if you have the phone option do it to a direct line or your cellphone just for the verification process. I did this previously and it didn't pull the phone number through to the listing.
Just did a little more research - Apparently one reason they do offer phone verification is if it was already listed and needs to verified only or you previously verified by phone.