With OS X 10.10 Yosemite, Apple introduced its Continuity feature that lets you field phone calls and text messages from your iOS devices and Mac. I enjoy being able to respond to texts from my MacBook Pro and iPad when my iPhone is charging, but I’m less sold on sharing phone calls between all three devices. I don’t like the cacophony of ringtones when all three devices are nearby, and I find that even when it’s charging, my iPhone is never too far away that I can’t grab it to take a call.
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https://www.cnet.com/how-to/how-to-disable-phone-calls-on-your-ipad/