A feature coming to Android called Link Your Devices will allow you to start a call on one Android phone and seamlessly end it on a linked phone.
According to Mishaal Rahman (via AndroidCentral), who wears many journalist hats but is better known as an expert on Android, Google is working on a new feature called Link Your Devices which will, well, link Android devices signed into the same Google account. That will allow you to start a phone call on one Android phone and seamlessly switch to a linked phone without a hiccup. The feature is called „Call switching“ and is the only option available on the Link Your Devices menu page.