Sos
What does it mean when SOS is shown on top right of phone screen?
iPhone XR, iOS 16
If you see No Service or Searching in the status bar on your iPhone or iPad (Wi-Fi + Cellular), your device isn't connected to a cellular network. If you see SOS or "SOS only" in the status bar, your device can still make emergency calls.
If you see No Service, Searching, or SOS on your iPhone or iPad