[andrewaylett]

In the UK, "stopped with the engine running" counts as "driving" for the purposes of smartphone use — no using your phone when stopped at the lights.

Not that the rule stops some people from doing it anyway, of course.

[whatevertrevor]

I think it's a similar thing in Ontario, Canada (where I live), you can be fined for checking on your phone even at red lights, though there are some caveats for "operating the car" related things (for example if you're using nav on your phone).