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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Aug 9, 2013 2:53 PM in response to harleydeelby sberman,Not by itself ... assuming you have done everything else as you should have been doing. Examples of things you should have been doing include keeping iTunes up to date, and syncing.
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Aug 9, 2013 2:54 PM in response to harleydeelby Carolyn Samit,Backup your iPhone first just in case > iOS: How to back up and restore your content