Since the law coming into effect, I've been watching the cars around me for evidence of old-style cell usage.
Total count for the one year period was 29. I'm fairly certain that prior to the law going into effect, I'd see that many and more in an hour, let alone a year.
I hope that the accumulated data show a commensurate decrease in automotive accidents; it would be a pity if they put it into effect to simply allow themselves to gather more income for tickets, wouldn't it?