I occasionally see in the local paper that someone was fined. However, I often see drivers chatting away with the phone to their ear as they lunge round corners and roundabouts without notice. I've had to leap out the way more than once when I've walked across junctions to avoid being hit by someone with their phone clamped to their ear.
I read recently that someone chatting on the phone while they drive is only devoting 10% of their attention to the driving - the other 90% is on the conversation! Certainly, the law is no deterrent. It is one thing having big fines. But if drivers know they won't be caught then obviously they won't bother to stop or ignore the phone.