Can I use my old SIM card?
Can I use my old SIM card from my non working iPhone and put it in the new iPhone ?
iPhone 12, iOS 16
Yes, if it both use the same size and if your new phone will even let you use a conventional SIM card. These documents should provide the information you need:
Learn which size SIM card your iPhone or iPad uses - Apple Support
Remove or switch the SIM card in your iPhone - Apple Support