iPad, IPhone on different carriers
If my IPhone is with one service carrier and my IPad with another will I still be able to link them to receive FaceTime, calls and iMessages on my IPad?
Question marked as
Yes.
The carrier on the iPad is only used for Internet access through a data connection. It cannot be used for calls and messaging. That is done through the paired iPhone only.
click here ➜ Make and receive phone calls on Mac or iPad - Apple Support
and here ➜ Forward text messages from your iPhone to other devices - Apple Support