How to activate iPhone12 and import original phone data?
I hope it helps. Here are all the options.
Use Quick Start to transfer data to a new iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT210216
Use iTunes or the Finder to transfer data from your previous iOS device to your new iPhone.
https://support.apple.com/en-us/HT210218
Restore your iPhone, iPad or iPod touch from a iCloud backup
https://support.apple.com/en-us/HT203977