iPhone 6s, iPad Pro. My Yahoo email address was corrupted, so I have spent the last couple of days migrating everything over to a new gmail address. I have a new Apple ID, enabled on both devices. I cannot get them to share text messages without turning on iCloud, which I didn't have to do until I had to change things. I have done everything Apple says to do on both devices, and have rebooted both devices. The iPad is WiFi only, but was working just fine two days ago.