It's not a "voicemail setting" really....it is the default code your phone dials to access your voicemail.....2 ways to change it: open phone dialer, open menu>settings>call settings>voicemail settings>voicemail numberHow are you trying to change it? Usually if you change it in voicemail settings, then you need to restart your phone after to make it stick.
Or open phone settings menu>applications>call>voicemail settings>voicemail number.
Tried both, tried resetting phone after, tried tips and tricks that people posted on line that worked for them....to no avail, but eeesss okay.....got my work around figured out
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