anticitizen13.7
Not posting at TMC after 9/17/2018
The reason that occurs to me that Tesla might not use them is perhaps it gets 3g coverage cheaply and LTE would cost more. Since they are footing the bill for now....
There are 2 things to consider!
First, the hardware (baseband chip) in the car. Second, the type/speed of connection with the wireless carrier.
Model X should have LTE hardware on board. In 2014, LTE is the standard for nearly every mobile phone sold in the United States.
With respect to the speed of the connection, Tesla could ask AT&T to "throttle" the LTE connection to HSPA (3G) speeds. AT&T has been suspected of clamping down on bandwidth from mobile phone subscribers who use too much data in the past. However, I'm not sure that asking for slower data speeds is the best thing as far as user experience.
It may be a moot point though, as many people will tether their Model S to an LTE capable smartphone.