How to restore my old phone

Use a computer to back up the 12 and then restore the 13 with that back up. Make sure they are both updated to the latest iOS and follow the steps here:

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

]KiddtheGreat Said:

"How to restore my old phone: I have a 13 pro max now and I used to have a 12 max how can I restore my old phone on the new one?"

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Transferring to a New iPhone:

Did you Use Quick Start?: Use Quick Start to Transfer Data to a new iPhone or iPad - Apple Support