SIM card from the previous iPhone
I bought iPhone 13. It works without SIM card. I still have my SIM card in my previous iPhone X. What do I need to do with an old SIM card?
iPhone X, iOS 14
Question marked as
If you are planning to dispose of the previous phone remove the SIM card and follow these instructions→What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support. If you are keeping the phone to use as an iPod leave the SIM card in it.