Hmm, I'm not 100% sure to tell the truth.
On broadband that you don't have to connect to, and so is always connected, this wouldn't be a problem, yet if you have to still put a number in to connect, the problem could still be there.
The trouble with ADSL is the fact that it still has to go through a phone line, so yes, the issue probably is still there
As long as you are protected though, it shouldn't be an issue, and no number should change.
If something has though (always double check), phone your provider, or try changing it back to how it was to see if it connects as usual, and do a scan for any threats as to why it has changed.
I hope this helps.