An adult driver shall not drive a motor vehicle while using a wireless telephone unless

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The key idea is reducing driver distraction by not holding a phone while driving. You’re allowed to use a wireless telephone only if you’re using it in hands-free mode, meaning you’re not holding the phone. A hands-free setup can be a Bluetooth earpiece, the car’s built-in hands-free system, or a mounted speakerphone. This keeps your hands on the wheel and your eyes on the road, which is why the rule permits driving with a hands-free device. The other options don’t fit because the restriction isn’t about location, a passenger, or whether you’re in a parking lot; it’s about whether the device is hands-free.