Where do I find SIM card for new iPhone 13?
Where do I find SIM card for new iPhone 13.
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It may not have or need one. See the following from About eSIM on iPhone - Apple Support
If you purchased an iPhone 13 model from an Apple Retail Store or Apple Online Store in the United States, your iPhone won't arrive with a SIM card installed. To activate your iPhone, turn it on, connect to a Wi-Fi network, and follow the onscreen instructions.
If that isn't what you were asking and your phone does have a SIM card, see: Remove or switch the SIM card in your iPhone - Apple Support