When is it legal to use a cell phone while driving without a hands-free device?

Using a cell phone while driving is regulated to improve road safety and reduce distractions that can lead to accidents. One specific legal exception allows drivers over the age of 18 to use their phones without a hands-free device when making calls for emergencies. This is based on the understanding that emergencies may arise unexpectedly and require immediate communication that cannot wait for the driver to pull over safely.

In contrast, the other options suggest scenarios where phone use is either not regulated by the same emergency exceptions or could potentially introduce risk. For instance, simply being over 18 and on a non-emergency call does not justify using a phone while driving. Making calls for emergencies is necessary to facilitate rapid responses to urgent situations, which is why it is legally permissible.