The term "car phone" can be replaced by several synonyms that all refer to a phone system installed in a vehicle. The most common synonym is "car kit," which implies a comprehensive setup that includes a hands-free device, a microphone, and a speaker. "In-car phone" is also often used and accurately describes a phone system that is specifically designed for use inside a car. Other synonyms include "car cellular phone," which focuses on the device's cellular connection, and "mobile phone for the car," which emphasizes the phone's mobility and flexibility. Regardless of the synonym used, all these terms refer to a highly convenient phone system designed for use while driving.