What is the only authorized way for soldiers to use a cell phone while operating a motor vehicle?

The use of a cell phone while operating a motor vehicle is heavily regulated to ensure the safety of both the driver and others on the road. The correct method for soldiers to use a cell phone in this context is through the speaker or a hands-free setup. This approach allows the driver to maintain control of the vehicle without having to physically handle the phone, which can distract from driving. Hands-free devices significantly reduce the risk of accidents associated with manual handling of a phone during vehicle operation. Utilizing this method aligns with safety protocols and regulations that prioritize safe driving practices while still allowing for communication.

Options that involve holding the phone in hand or using a wired headset do not meet safety standards, as they can still lead to distractions. While voice commands can facilitate hands-free communication, they are not a standalone approved method unless accompanied by a hands-free system. Therefore, utilizing the cell phone on speaker or via a hands-free device is the only authorized method ensuring compliance with safety regulations.