So when I ride the bus or train, I'm allowed to use my phone? What about when I use an uber (or lift or any of the many many other local alternatives)?
Not everyone that moves at driving speeds is driving, especially in places outside of America.
It would also cost lives. In a serious emergency you can start driving someone to the hospital and call 911. In rural areas when ambulances can take 45+ minutes being unable to call and drive can be a big issue.
That’s just one of many edge cases where disabling cellphone service for moving callers is downright dangerous.
Not everyone that moves at driving speeds is driving, especially in places outside of America.