Imagine a world where everybody has multiple Portal TVs in their house. A person is having a call with multiple people on WhatsApp via their mobile device. They come into a room and say, "Portal, please transfer my WhatsApp call to the bedroom TV". They continue their video call on the bedroom TV and then as they are leaving the bedroom, they say, "Portal, please transfer my WhatsApp call to my phone." They then continue their video call on their phone,