ok so i have an iPhone 3GS. It is running 3.0.1 firmware. I have the MMS working and tethering...It is jailbroken, and I am using AT&T. I also am using the 5.0 carrier file. so all is working perfectly except when I try to use my visual voicemail it calls my voicemail like a regular non-iphone, and doesn't use the actual visual voicemail. Now I have tried resetting my network settings because apparently several people say that is the "fix" to this problem, but it has not worked for me! does anyone know of any other fix for this problem to get my VVM working?! thank you!