Restore iCloud
New phone won’t load all texts and contacts from old phone
Question marked as
First, did you follow this guidance→Transfer data from your previous iOS or iPadOS device to your new iPhone or iPad - Apple Support
Note that transferring content does not transfer contacts, calendars, synced notes and synced reminders, because these items sync to whatever mail server or servers you set up as the source. When you add your email account or accounts back these items will populate to the phone.