Under Ministry of Public Security (MPS) Order No. 162, what is the regulation regarding mobile phone usage by commercial bus drivers while operating a vehicle?

1. Drivers may make handheld phone calls if driving at speeds under 30 km/h in urban bus lanes
2. Drivers are strictly prohibited from answering handheld calls, texting, watching video streams, or browsing devices while operating the vehicle
3. Drivers may send voice messages as long as both hands remain placed at the top of the steering wheel
4. Handheld phone calls are permitted as long as the conversation pertains directly to bus route scheduling