Use mine all the time in a dash holder, they've never batted an eye.Someone will be round to smash your back door in later
Would have been a fine on the spot I would have thought. That said picking up your phone in the car for anything now is likely to get you in trouble if caught, even using it in a cradle can be dodgy ground if the police think you are distracted.
As long as your sensible it's no different than reaching over to change the fan settings.

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