1G cell phones from 2001 bear little resemblance to the 4G and 5G phones we use today. Much more primitive, and lacking the location tracking which helps 5G work well today. We can't use what works with today's technology to decide what would work 24 years ago.
The dealership may have its own rodents so the wires may be being chewed right now.
Check if you can return the vehicle under lemon or warranty laws for a new one.