Is Tesla not big enough to negotiate off-peak discounts? Do US carriers not support that type of thing? It's such an obvious solution I can't believe they don't

Is Tesla not big enough to negotiate off-peak discounts? Do US carriers not support that type of thing? It's such an obvious solution I can't believe they don't do it. When I visited Sri Lanka, $8 at the airport got me a SIM card and something like 16 GB of data. ~4GB during the day, and the rest at night. So blatantly rational. Wireless congestion is not a problem at 3am. I've worked at an ISP long enough to know what consumer access patterns look like.