I had a problem with my iPhone 4’s voicemail button calling my voicemail phone number instead of displaying my visual voicemail. Here’s how to fix it:
- reboot your phone for good measure
- have a friend call your number and leave a voice message
- wait 10-20 minutes and it should work again
- if it doesn’t seem to work, try having your friend leave a few more messages
There’s something about leaving multiple messages that gets visual voicemail up and running again.
I’m on AT&T, iPhone 4 iOS 4.3.