California Phone Laws for Drivers: Adults, Teens and the Mounted-Phone Rule

In California, an adult driver may talk on a phone only when it is set up for hands-free use, and may touch a phone only when it is mounted on the windshield, dashboard or center console and the touch is a single tap or swipe. Holding a phone and using it while driving is off limits for everyone. Drivers younger than 18 are kept off phones and other wireless devices entirely while driving, hands-free included, with an exception for emergency calls.

That is the whole rule in three sentences. It comes from three sections of the Vehicle Code, 23123, 23123.5 and 23124, and the DMV handbook adds its own safety advice on top. Below, each part is explained with the questions families ask most: maps, music, texts by voice, red lights and what a ticket costs.

The three laws side by side

Systems built into the car by the manufacturer are outside 23123.5, which says so directly. A phone resting in a cup holder or on a lap is not mounted, so the single-tap allowance does not apply to it.

The mounted-phone rule for adults

The DMV handbook says the same in plain words: mount the phone on the windshield, dashboard or center console where it does not block your view, and use the single swipe or touch feature. Anything that takes a second motion, like typing, scrolling a list or pinching a map, needs the car to be parked first.

Under 18: no phone use at all

For drivers younger than 18, the rule is stricter and simpler. Vehicle Code 23124 applies to drivers under 18, and it forbids driving while using a wireless phone or wireless device even when the device is hands-free. Its definition of a device is broad: it includes phones, laptops and tablets with mobile data, pagers and two-way messaging devices.

The DMV's provisional licensing sheet (FFDL 19) restates the ban and notes two limits on it: calls for emergency services are allowed, and the rule does not reach driving on private property. The same statute bars a police officer from stopping a car for the sole purpose of checking whether a teen is breaking it. In daily life, that means a teen driver makes no calls through the car speakers, sends no voice texts, and does not tap the screen to change a playlist. The other first-year limits, on passengers and late-night driving, are in our provisional license guide.

Texting, voice texting and reading messages

Typing a text is always out while driving: on a handheld phone it breaks 23123.5 directly, and on a mounted phone it takes far more than one tap or swipe. The handbook's advice goes further than the statute. It tells drivers to leave texts and email alone while driving, to let a ringing phone go to voicemail, and to park somewhere safe before placing or returning a call. It also says adults should use a phone in hands-free mode only when necessary.

For adults, a phone designed and configured for voice-operated, hands-free use and used that way is within the law. For a driver under 18, voice texting is still phone use while driving, so it is not allowed.

Maps and GPS on the phone

Adults can follow phone directions if the phone is mounted in an allowed place and the driver touches it only with a single tap or swipe. Type the address before the car moves. A new destination, a detour search or zooming in by hand all take more than one motion, so find a safe place to stop first.

Vehicle Code 23124 contains no navigation exception for drivers under 18. Teens should set the route and the audio before leaving, ask a passenger to handle directions, or pull over and park before touching the phone. For a first solo drive somewhere new, like a trip from El Dorado Hills to a friend's house in Granite Bay, reading the turns once at home is better than glancing at a screen on the way.

Emergencies

Both 23123 and 23124 leave room for emergency calls: to police, a health care provider, the fire department or any other emergency service. The handbook confirms that minors may use a phone to call for emergency help. Running late is not an emergency, and neither is a parent's text asking for an arrival time.

Fines and points

All three phone statutes use the same base fine: $25.01 the first time, $50 for every repeat. That number is where the bill starts, not where it ends. Other laws stack penalties on top; Penal Code 1464 by itself levies another $10 on each $10 of fine, and further assessments may apply. Because the court works out the total, we don't publish one.

Points arrive with repeats. Vehicle Code 12810.3 gives a violation point for a conviction under 23123(a), 23123.5(a) or 23124(b) when the new violation took place on or after July 1, 2021 and less than 36 months after an earlier conviction for that same offense. For a driver with a provisional license, any point counts toward the DMV's restriction and suspension steps for teens.

A routine that removes the decision

The law sets a minimum. A routine makes it automatic. We teach a three-part start before the car leaves the curb: route set, audio set, phone out of reach. A phone in a bag on the back seat cannot pull eyes down when it buzzes, so there is nothing to resist.

Our training cars work the same way: handheld devices stay put away for the whole lesson. Our teaching method keeps the student describing what they see ahead, and a drop in that commentary is often the first sign attention has gone to a screen. When a phone buzzes during a lesson, the instructor's response is brief and calm: eyes stay on the road, and the phone waits until the car is parked.

Parents can use that same short line during supervised practice, and model it too. A teen who sees the phone go into the bag every time an adult drives learns the habit long before the first solo trip. For how lessons run, see teen driving lessons.

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