If you open Messages you may see a few messages appear. Your new phone will start to download everything from your back-up, including all your messages.
(If you backup over iCloud you may be prompted to make a new backup on your old iPhone – handy if you hadn’t already done so – this new backup will then be synced with your new iPhone when you Restore from iCloud.) Reset your new iPhone and start again: Open the Settings app and tap General > Reset > Erase All Content and Settings.)
(Note that if you’ve already been through the setup process and your Messages were missing, but you have now made sure you have a backup of your old messages, you may need to Setting up a new iPhone, but the steps that are most relevant here are as follows. You just need to sync your new iPhone with the latest backup from your old iPhone, we have a separate article on
