One of the people in my office has an iPhone and was having problems in that the office voicemail system would only accept his password 25% of the time. It was getting really frustrating.

As it turns out, the iPhone mic may be interrupting your button presses being recognized, especially in a noisy environment. Here’s the fix

  1. Dial the office voicemail on the iPhone
  2. Mute the iPhone
  3. Dial your password
  4. Unmute the iPhone, if you want

Its a seriuosly simple fix, however, its not that obvious. We only got to the bottom of it because of inconsistencies between how often it would happen with and without a bluetooth earpiece.