Thanks for the information. My system has its own cellular connection. Maybe someone else's system sent the wrong phone number or address.
Just make sure if you also have VoIP that the panel isnt connected to that line. Most companies would still connect to the phone line and set the cell as a backup communication path. A residence can be cell only under NFPA code.
If you still pay an old-school RBOC like ATT for a POTS line (traditional analog phone line) that is OK. Its the switch to services like Comcast Triple Play that is screwing people.