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I want to take a SIM card out of an iPhone 7, stick it into a Samsung Galaxy A30 for a day in order to make calls from that A30, then switch the SIM card back to the iPhone. Do I need to back up the iPhone's data before doing this, or will it all still be there when I put the SIM card back?

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  • Datas are stored into your iPhone and will not be erased even after removing the SIM card. However it is relevant to make a backup of your iPhone regularly or every time you make something particular with it.
    – tama
    Commented Mar 23, 2021 at 23:25

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No data is lost on an iPhone when a SIM card is being removed or inserted.

The only thing to keep in mind: You might need the SIM PIN (if there is any set) to use the card in a new phone.

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