How to transfer contacts to new iPhone?
How do I transfer my old phone contacts to my new phone?
[Re-Titled by Moderator]
iPhone 12, iOS 16
If you turn on iCloud, you get 5 GB of free iCloud storage. Information such as contacts, calendars, bookmarks, notes, reminders, voice memos are stored in iCloud.
You must use the same Apple ID.
See -> How to use iCloud on iPhone -> How to use iCloud on iPhone – Apple Support (UK)
See also -> If your iCloud Contacts, Calendars, or Reminders won’t sync
If your iCloud Contacts, Calendars, or Reminders won’t sync - Apple Support