Monitoring 16 on an older DSC handheld today and switched over to Wx to see what they were saying. After every sentence a recorded voice said "You don't have a valid certificate on file for this radio or don't have a license. Please contact our sales department immediately". Thought maybe NOAA put the wrong recording on so I checked a non DSC radio and all was normal. I was too tired to investigate further, I did notice a little envelope-like symbol on the screen. It's a domestic MMSI number and I was 50 nm north of the Mexican border, do they expire or did the radio "forget" it's number maybe ?