Same issue when I upgraded to 4.0 on the Rogers Network, never really did dig deep as to what was the cause but the quick fix I found was to assign my VM# to speed dial (A) 416-555-5555,,0000# same principal hold the letter A to dial my VM.
Adding the extra numbers works fine however I can only take advantage of this feature (adding passwords etc.) when I select 'Call voicemail'. Pressing and holding '1' doesn't work and that's what I'm trying to figure out.
the answer is staring you in the face... (but I just couldn't see it).
Thanks for pointing out '1' is the same slot as 'W'. Either I had too much to drink or I was looking for a complex technical solution (based on OS configuration, etc, etc, etc) and you had the ability to point out the answer to me in one sentence.
All of this still doesn't explain what happened to the original voicemail speed dial entry that was created at setup. I don't recall having an entry for tmo vmail in my address book yet that speed dial existed. How/why did it get removed? Any ideas anyone?