Which of the following is a requirement for using a cellphone while driving in Maine?

In Maine, the law requires that if you choose to use a cellphone while driving, it must be hands-free. This means that drivers are not allowed to hold the device in their hands or use their fingers to operate the device while driving. The hands-free requirement is designed to minimize distractions and enhance road safety, allowing drivers to keep both hands on the wheel and their focus on the road.

The other options do not align with the state's regulations. Using a cellphone completely while driving without any restrictions is not permitted, nor is only prohibiting texting sufficient, as all handheld device use is restricted. Additionally, while emergency calls are important, the law is not limited to that scenario; it emphasizes the hands-free requirement for all cellphone use while driving.