SIM change
Will something on my iphone be lost or need to be reset if I replace my original SIM card with a new one? If that is the case, what can I do?
iPhone 12 mini, iOS 14
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iPhones don't store your user data on a SIM card, the card is used to provide carrier service. If you change the SIM card you should only really notice a change in the carrier used to provide your phone service (that's how it has worked for us).
Remove or switch the SIM card in your iPhone or iPad - "Learn how to remove or transfer the SIM card in your iPhone or iPad (Wi-Fi + Cellular models)."https://support.apple.com/HT201337