Thanks to D. Young for this one:
Ian,
Found the answer and figured I’d pass it along.
For those who’ve unlocked and have a non-functioning Voicemail button,
here’s how to fix it:1. First, take note of what your voicemail number is with your current
provider (for example, in Spain the Vodafone
<http://modmyiphone.com/wiki/index.php/Getting_voicemail_to_work_on_unlocked_iPhone>
voicemail number is 177).2. Click the phone
<http://modmyiphone.com/wiki/index.php/Getting_voicemail_to_work_on_unlocked_iPhone>
button in your iPhone
<http://modmyiphone.com/wiki/index.php/Getting_voicemail_to_work_on_unlocked_iPhone>.3. Click the keypad tab.
4. Type the following code
<http://modmyiphone.com/wiki/index.php/Getting_voicemail_to_work_on_unlocked_iPhone>:*5005*86*xxx#
Where xxx is your voicemail number.**
5. Hit call.
6. Give it a bit, and the code will be set.
7. Hit the voicemail button, and it will now call your voicemail.
Regards,
D. Young
