ATT iPhone Visual Voicemail Not Working After iPhone 3.1 Firmware Upgrade
After upgrading my iPhone to firmware version 3.1 my Visual Voicemail stopped working. Initially I wasn’t sure what the issue was but I was not receiving voicemail via the iPhone. I did finally find out that I could retrieve the voicemail by holding the 1 key which will then dial voicemail and let you retrieve your voicemail. If you are able to retrieve your voicemail by holding the 1 key but the voicemails are not showing up in the iPhone voicemail interface then there is an issue with what ATT calls Visual Voicemail.