If you don't see the option to Use Another Apple Device or it isn't working, update to the latest version of iOS or iPadOS on both devices. If contacts are not enabled, or if you're not in his Contacts list, you won't be able to communicate with him via FaceTime or iMessage if you. * To sign in with another Apple device, Bluetooth must be turned on for both devices and both devices need compatible software. First, note that he will need to have Contacts enabled in iCloud, and you (and anyone else with whom you want him to be able to communicate on his iPad) will need to have your contact saved in Contacts. Learn more about how to set up and sign in to your Apple Watch. If you're already signed in on the iPhone paired with your Apple Watch, you will automatically be signed in to that Apple ID on your watch.
When you're signed in with your Apple ID, you can find the email addresses and phone numbers that you can use to sign in, as well as add additional email addresses and phone numbers: Settings > your name > Sign-In & Security. If prompted, enter the six-digit verification code sent to your trusted device or phone number to complete sign-in.
Sign in Manually: Enter your Apple ID (or an email address or phone number that you use with Apple services) and your password.Use Another Apple Device: If you have an iPad or another iPhone that’s signed in with your Apple ID, bring that device nearby and follow the instructions on both devices to complete sign-in.*.
