It really depends on where the modem is.
In some Ford vehicles, the Telematic module has a separate fuse and can be removed.
Would need more information, (year, make, model, etc). To look over there networks and schematics to be more specific.
Anyone know if there is a way to disconnect the computer for tracking etc on newer vehicles to disable it to not screw with driving the vehicle
https://www.bronco6g.com/forum/threads/psa-with-regard-to-ford-selling-your-driving-data.98785/
Discussion
Dm sent
Were you able to find anything? I have no clue to make it happen but I would be willing to pay someone to do it