Using iphone like a landline
I have a two-story house, and want to eliminate my landline and just use my iPhone, but don't want to have to carry it from room to room. Is there a device that will allow remote answering and calling so I can make/receive calls on the iPhone without having it in the same room (or floor) with me? If it could work for multiple iPhones, that would be good too!
iPhone XS, iOS 14