https://www.vice.com/en_us/article/j5ywxb/rcs-rich-communications-services-text-call-interception

A standard used by phone carriers around the world can leave users open to all sorts of attacks, like text message and call interception, spoofed phone numbers, and leaking their coarse location, new research reveals.

The Rich Communication Services (RCS) standard is essentially the replacement for SMS. The news shows how even as carriers move onto more modern protocols for communication, phone network security continues to be an exposed area with multiple avenues for attack in some implementations of RCS.