There are widespread outages of the 4 large carriers.
https://downdetector.com/status/t-mobile/map/
https://downdetector.com/status/verizon/map/
https://downdetector.com/status/sprint/map/
https://downdetector.com/status/t-mobile/map/
https://downdetector.com/status/verizon/map/
https://downdetector.com/status/sprint/map/
Looking like a Chinese cyber attack to me.