Is the SIM card from an iPhone 7 Plus compatible with the slot for iPhone 13 Pro?
Is the SIM card from an iPhone 7 Plus compatible with the slot for iPhone 13 Pro?
Question marked as
It is the same physical size and will work to place and receive calls and data …
… however you SHOULD get a reprovisioned SIM (or eSIM profile) to ensure full access the 5G capabilities of your new 13.
