I finally updated my 3GS to iOS 6. Where I found I now have visual voicemail on T-Mobile. Whereas in iOS 5 and before when I clicked the voicemail button it would just call my voicemail box and I had to navigate via keypad. This all seemed great until much to my surprise and chagrin I found out that visual voicemail was not delivering all my voicemails. I was getting some voicemail right away so I thought everything was fine. Until some voicemail that was two or three days old suddenly popped up. I cannot trust an inconsistent system that will only throughput some voicemails but not others. Is it possible to disable visual voicemail and return to standard voicemail? Where it just notifies me via a red badge that there is voicemail, and I press the button to dial in, listen and navigate via the keypad. I can't even find the network settings in iOS 6 were you program in carrier settings as you would in iOS 5. Disabling mobile data is not an option I need the e-mail.