[mattlondon]

I am guessing but I suspect there is an "easily accessible" SIM slot somewhere. Might be somewhere convenient like behind a panel in the glovebox, or might be in the bowels of the engine bay along with the other ECU things.

I would be surprised if it was not "easily" removable though ... Unless they are using esims now?

(Nothing in modern cars is "easy" to do - everything is a bitch to access and tighten/untighten etc - even oil filters etc which in theory should be able to be changed regularly are sometimes in incredibly inaccessible locations)

[ninalanyon]

The SIM card in my 2015 Tesla S is definitely not quickly accessible but it is fairly straightforward. Tesla's mobile service technician took close to 20 minutes to remove various bits of trim under the bonnet, replace the SIM card, put everything back together, and check that it worked.