Dogtrousers
Kilometre nibbler
I don't think this is the case.it would be perfectly possible to use the mobile phone while waiting for the lights to change without any material distraction.
The driver needs to maintain awareness of what's going on all around whether stationary or not. If someone starts looking at the phone during a red phase they will assume, when they start moving, that everything is as it was when they looked down. Wrong assumption. While they were gawping at their phone, much could have changed. Do they pause before restarting, to re-check all round to see what they missed while distracted? Do they buggery.