sim card
Im transferring data to a new iPhone....when do I transfer the SIM card
iPhone 11
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See this Apple support link ➡️ Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
But basically, the first step (after backing up the old phone) is to transfer the SIM. HOWEVER, if you are upgrading to an iPhone 12 series you should get a new SIM (or eSIM) from your carrier that supports 5G rather than moving your old SIM.