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Think it's slightly more nuanced. The law is that you must not use a phone "while driving".
If you are clearly parked you can use your phone even if the engine is running. You can't if you are merely stopped in the road, at traffic lights for instance.
For instance, it would be a bit harsh to prosecute someone for using their phone while they waited for their car to thaw on a frosty morning.
She should have turned her engine off anyway of course. To save our lungs, the planet and the tax payer the cost of wasted fuel.
got the attention of a police woman parked outside sainsbury's with her engine running scrolling through facebook yesterday, i asked if i was correct in thinking that it's illegal to use a mobile device with the engine running, she thanked for me for letting me know, I said you should really know that already. She glared. I smugged.