We are becoming less and less dependent on mobile networks. You can get a data signal almost everywhere that you can get a mobile signal and most of us are around WiFi most of the time anyway.
RCS 4.0 will kill FaceTime, if you can wait until Android 19 ...
A fresh update to Google’s Phone app is poised to alter how Android users manage voice calls. The feature, now appearing in beta testing, is already raising questions about privacy and consent.