I have a 5200 that I use infrequently in a little used Jaguar XKR. I brought the car out of winter hibernation and got the TT deactivation message yesterday. Very annoyed that although I am in UK and the 2G network is still active, it seems that TT has already deactivated my SIM as I have no traffic connection.
I read a helpful contribution in this thread about using the Tasker app to automatically switch a phone’s hotspot on when it detects the car’s bluetooth, which seems a good solution, but Tasker is an Android only app.
For those who have an iPhone there is a Shortcuts app in the appstore which seems to do the same thing. I have just downloaded it on my phone and set it to turn on the hotspot when it detects the car’s bluetooth. Hopefully it will save the trouble of fiddling around whenever I get in the car.