What is the Massachusetts 'hands-free' law regarding cell phone use while driving?

1. Drivers may use handheld phones at red lights and stop signs only
2. All drivers must use hands-free mode; handheld use is prohibited while operating a vehicle
3. Only drivers under 18 with a Junior Operator License must use hands-free mode — Massachusetts bans handheld phone use for all drivers while operating.
4. Cell phone use is only prohibited on limited-access highways and expressways