I'd say it's becoming more often than not that I'll look in my rear view mirror stopped at lights or a roundabout or similar and the person will be really enjoying staring at their own crotch
One of the lorry drivers at work recently was saying they think it should be an instant 6 months to a year driving ban being caught on the phone - being so high up they see a lot of it and have had a few close calls with vehicles which suddenly slow down in front of them and they can see the person is responding to their phone, etc.