As of January 1st, 2021 unless a motor vehicle is parked or stopped it is illegal in Arizona to talk or text on a cellphone while holding or support a device with your body unless the device is in a hands-free mode. That includes you can’t have the phone on your lap.
Arizona Revised Statute 28-914
First violation: $75 – $149 fine
Second or subsequent violation: $150 – $250 fine