Under Chilean Law 21.377 (Ley No Chat), what is prohibited regarding mobile phones and digital devices while driving?

1. Holding or manipulating any mobile phone or digital device while operating a motor vehicle, including when stopped at red lights or stop signs
2. Using mobile phones only on highways
3. Making phone calls with certified hands-free devices that require no manual handling
4. Using a dashboard-mounted GPS unit that was configured before starting the trip