HT201270: Update your carrier settings on your iPhone or iPad
Learn about Update your carrier settings on your iPhone or iPad
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Helpful answers
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Nov 13, 2013 6:10 PM in response to marafromqldby ChrisJ4203,The only thing you can do on the iPhone for this is to try a reset. Hold the sleep/wake and home buttons together until you see the Apple logo and then release. I doubt it will help. The best option is to contact your carrier, as voicemail is a carrier function. They are the ones that activate or deactivate voicemail.