Sign in to the same Apple ID on both iPhone and iPad
Open Settings on both devices
Tap your name at the top
Turn on iCloud for the content you want to sync
Turn on Photos
Turn on Contacts
Turn on Calendars
Turn on Notes
Turn on Reminders
Turn on Safari
Turn on iCloud Drive
Turn on Messages if you want texts to sync
Turn on Health if available
Turn on Keychain if you want passwords to sync
Turn on Bluetooth and Wi-Fi on both devices
Keep both devices connected to the internet
Update both devices to the latest iOS or iPadOS
Use AirDrop to transfer files directly between devices
Use Finder on Mac or iTunes on Windows for backups and restores
Use the same app accounts on both devices for app-specific syncing
Check app settings for sync options in third-party apps