Just a hint about my old callback number problems...

Apparently, I have been "grandfathered in" to Google Voice. My Canadian callback numbers were imported from Grandcentral, but I cannot edit them nor can I add any new Canadian numbers. This is a (stupid) GV policy, not the fault of your application.

This may be why I was having problems in the first place with the callback numbers.

I have also noticed the missing callback number field.