I’m on iOS 13 beta, too. I read articles online that explain how to do it. Wait for your new phone to arrive, then backup your old phone BEFORE removing the beta profile on it (as a precaution in case there are probs downgrading). If you have Apple Watch data, you’ll want to do all this at the same time so you don’t lose your steps/calories, etc. After backup of your old phone, remove the beta profile under Settings —>General—>Profiles and Device Managment Choose the Beta profile and hit “Remove Profile.” Follows whatever instructions that pop up, then once the profile is removed and your phone has restarted, check that all your apps, data, etc looks correct, nothing missing, etc.Mine came in 3.5 hours early. Usually they go to all the businesses near by first but he showed here at 1130. Now I'm hving to deal with my old phone being on 13.1 beta and now I can't restore from back ups.![]()
Now do a SECOND backup of your phone to iCloud, which should now be on the iOS 12 version. If it prompts you to upgrade to iOS 13 official/Gold version and you want to do it, then I’d still do the second backup before upgrading your old phone, since upgrades can get wonky and you don’t want to lose data.
If you don’t upgrade old phone to iOS 13, restore your ios12 backup to your new phone, then when everything is working and all your data has synced, I recommend “Erase Network Settings” to avoid any Bluetooth/WiFi issues that sometimes happen when moving to a new iOS.