Texting While Driving

In my opinion, this law sucks. It just became a law four days ago and cellphones have been around for how long? It's a habit for most people to call or text people while driving. And if police can't even tell the difference between calling, texting, on the internet, going through contacts, or looking through music, then what's the point in enforcing the law? People are either going to get away with it with no problem or get pulled over for doing an innocent act. There shouldn't be a law for this.