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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May 26, 2013 11:29 PM in response to erenfromnswby Ocean20,If you are talking about iOS 6.1.4 and you have an iPhone 4 then this update is not for you, it only applies to iPhone 5 and has to do with a speakerphone profile issue
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May 26, 2013 11:49 PM in response to erenfromnswby Courcoul,And to complement, any iOS update is akin to installing a new Mac OS or Windows version. There is always a risk of data loss. That is why we recommend that all updates be done thru iTunes and using local storage for the backup.