I don't know if it's Subaru, Starlink/Turner, or Silliness/XM "Radio", but someone has shared my cell number and text number to the world. Started about as fast as my new car was signed for. I just got another text, saying a guy in New York wants to send me and two other people a cut of his latest Lotto winnings. Just have to go to his website.
Started about as fast as my new car was signed for.
There's another possibility: Public records. There's a good possibility that the public information from car registrations includes phone numbers. The amount of information that one can get just from a dump of public records is staggering.