KMVRETER- In California we have three laws that cover Cell phone usage
1. Distracted Driver-can also be used for loud radio, make-up or turning your head and talking to passengers etc.
2. Mandatory Use of a hands free device except in the case of emergency.
3. No text while driving- yes that means even reading a text you recieved.
One time my blue tooth died and I was pulled over to side of the road legally with vehicle in park and had a Cop pull up and still harass me, thankfully no ticket.
OP- It is very hard to fight Cell Phone and Seat belt tickets. 99% of the time the Courts will take the word of the officer over yours even if you bring in your phone records. All the officer needs to say is "Suspect appeared to be on the phone when I saw him." Notice the word appeared and not was same thing with seat belt. Appeared to not have it on. Sorry about your luck but I hope you can get it reduced at a minimum.