Per this Apple support doc you should be able to configure your iPhone/iPad pair so you have true WiFi calling and [it] “allows iPad and other devices where you’re signed in with the same Apple ID to make and receive calls even when your iPhone isn’t nearby”. (emphasis added)
This has been working for me for years, but I had some mishap with my devices were I logged in/out of my Apple IDs. Now I cant make/receive calls on my iPad unless it goes through the iPhone. As soon as the iPhone is not connected to the same WiFi, the iPad won’t do calls.
How can I fix this? AppleCare was worse than useless.
- sign out of iCloud on both devices, reboot, sign in
- resetting Network
- resetting All Settings