HT2458: AT&T: Setting your voicemail password on iPhoneLearn about AT&T: Setting your voicemail password on iPhone
Currently Being ModeratedOct 22, 2012 8:32 PM (in response to Dorist40)
Which carrier do you have? Once you have entered the passcode for your Visual Voicemail, it should not prompt you for it again. You cannot turn off the passcode, but as I said, once it is entered, it should remain and not prompt you for it again. I have a help document for AT&T, but that is all.