Open the Messages app on your iPhone, iPad, or Mac
Sign in with the same Apple ID used for iCloud
Turn on Messages in iCloud on your device
On iPhone or iPad, go to Settings
Tap your name
Tap iCloud
Tap Show All
Turn on Messages
On Mac, open Messages
Click Messages in the menu bar
Select Settings or Preferences
Click iMessage
Enable Messages in iCloud
Wait for messages to sync from iCloud
Check the Messages app for retrieved conversations
Restore from an iCloud backup if messages are not visible
On iPhone or iPad, go to Settings
Tap General
Tap Transfer or Reset iPhone
Tap Erase All Content and Settings
Set up the device again
Choose Restore from iCloud Backup during setup
Select the backup that contains the messages
Use iCloud.com to check available synced data if needed