All Tesla's come with SIM cards so the question is connectivity. Some opt not to connect hence go through WiFi. If they connect, it is $9.99 per month which gives the ability to get over the air updates and infotainment package while moving.
As for the inference, it is dependent upon the hardware if would imagine. each generation of hardware can handle more. The size of hardware 5 will likely allow it to be moving, even on FSD, and handle inference. I am not sure of the potential of it on the earlier versions. It might have to be done when the vehicle is not being utilized.