Check that your computer has an internet connection.Make sure you have the latest version of macOS or the latest version of iTunes.If you still can't activate your iPhone or iPad, try again using your computer instead: If you see an error message on your iPhone or iPad that says the activation server is temporarily unavailable or cannot be reached when trying to activate your device, wait a few minutes, then repeat the previous steps.If you're using a mobile data connection, connect to a reliable Wi-Fi network instead.
