HT201337: Remove or switch the SIM card in your iPhone or iPad
Learn about Remove or switch the SIM card in your iPhone or iPad
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Helpful answers
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Oct 27, 2015 6:51 AM in response to topcat11by topcat11,also
I seem to have lost music from my phone possibly after recent software upgrades?
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Oct 27, 2015 12:07 PM in response to topcat11by damaag,Hello
The answer to your questions depends.
The carrier is the one that uses the SIM Card, if you need to tell anyone it's them.
The iCloud works with you Apple ID or iCloud account. It will not effect that unless your synching through the cell data, that again is a carrier issue.
Hope that helps