Distracted Driving Accident
Lawyer California

California has two overlapping vehicle code provisions governing phone use while driving:

Vehicle Code § 23123 — The Hands-Free Requirement

VC § 23123(a) prohibits drivers from "using a wireless telephone unless that telephone is specifically designed and configured to allow hands-free listening and talking, and is used in that manner while driving." The statute requires that calls be made using a hands-free configuration — Bluetooth, speakerphone mounted on the vehicle, or voice-activated calling. The driver cannot hold the phone to their ear even briefly. The prohibition applies to all drivers on public roads in California.

Vehicle Code § 23123.5 — Texting and All Handheld Device Use

VC § 23123.5 goes further: it prohibits "a person from driving a motor vehicle while holding and operating a handheld wireless telephone or an electronic wireless communications device." This covers all handheld device use — not just calls. Reading and writing text messages, browsing social media, checking navigation while holding the phone, using apps, taking photos or videos — all are prohibited while driving. The device must be mounted (holder on dashboard or windshield) and configured for voice operation or single-tap use to be operated lawfully while driving.

The Hands-Free Mount Exception

Both statutes permit the use of a device that is mounted on the vehicle's dashboard or center console in a holder, provided the driver interacts with it in a single swipe or tap. A GPS navigation app running on a mounted phone is lawful — picking up the phone to type a new destination while driving is not. Understanding the legal/illegal line matters in civil litigation, because the defense may argue the driver was using a mounted device lawfully — cell records that show an active call with the phone held to the ear (established by the type of call activity and comparison with the car's Bluetooth logs) contradict that defense.

California's negligence per se doctrine — codified in Evidence Code § 669 — provides that a person's violation of a statute, ordinance, or regulation is presumptive evidence of negligence in a civil lawsuit if the person injured was in the class of persons the statute was designed to protect and the injury was the type the statute was designed to prevent.

VC § 23123 and § 23123.5 were enacted to protect other drivers, passengers, and pedestrians from accidents caused by driver distraction. A person injured in an accident caused by a driver who was violating the hands-free or anti-texting statutes is squarely in the protected class. The accident itself — a distraction-caused collision — is precisely the harm the statutes were designed to prevent. This means that proving the statutory violation (phone use while driving) establishes the negligence element of the plaintiff's case — the plaintiff no longer needs to separately prove that a reasonable driver would not have done what the defendant did.

What negligence per se does not prove: causation and damages. The plaintiff must still establish that the driver's phone use caused the accident (not some independent factor) and that the accident caused the plaintiff's injuries. In most distracted driving cases where phone use is established, causation is not seriously disputed — the driver's attention was on the phone rather than the road, and that inattention directly caused the crash.

Cell phone records are the most powerful evidence in distracted driving cases and are routinely obtained through the civil discovery process.

The Subpoena Process

California Code of Civil Procedure § 2020.410 et seq. governs subpoenas to third parties in civil litigation. A subpoena duces tecum directed to the wireless carrier — AT&T, Verizon, T-Mobile, or the specific carrier serving the at-fault driver's device — commands production of the driver's phone records. The subpoena typically requests: all outgoing and incoming call logs with timestamps, all text message logs (incoming and outgoing) with timestamps, all data usage records showing application access with timestamps, and voicemail records if applicable.

What the Records Show

Carrier records show every call made or received, every text message sent or received, and data usage events — all with precise timestamps to the second. A text message sent at 2:47:23 PM and an accident occurring at 2:47:45 PM demonstrates phone use 22 seconds before the crash. An incoming call answered at 2:46:58 PM and still active at the time of the 2:47:45 PM crash demonstrates active phone use at impact. Data connection records showing active application use (social media, navigation typing, gaming) in the 30–60 seconds before the accident timestamp provide powerful circumstantial evidence of distraction.

Preservation — Act Before Records Are Purged

Wireless carriers retain different record types for different periods. Call detail records are typically retained for 12–18 months. Text message metadata (the fact that a message was sent/received, with timestamp) is retained for shorter periods at some carriers. Data usage records retention varies by carrier. Acting promptly after an accident — by sending a litigation hold letter to the carrier and the at-fault driver before litigation is formally initiated — is essential to ensuring records are available when needed. A carrier that receives a preservation demand is obligated to retain the records pending litigation; a carrier that receives no demand may purge records in the normal course of business.

Bluetooth and Vehicle Data as Corroboration

Modern vehicles with Bluetooth systems log connection events — including when a phone was connected to the vehicle's Bluetooth and when calls were made hands-free through the car. If the vehicle's Bluetooth logs show no active call during the period of the accident, and the carrier records show an active call, the inference is that the call was conducted on the handheld device rather than hands-free — establishing the statutory violation. Vehicle infotainment system data is obtainable through the civil discovery process as part of the vehicle's on-board computer data.

Cell records are the gold standard but not the only evidence of distracted driving. Multiple other evidence sources can establish or corroborate phone use at the time of the crash.

Dashcam Footage

Dashcam footage from your own vehicle shows the road conditions in the moments before the crash — including the approaching or following vehicle and its behavior. If the dashcam captures the other driver's face or hands through the windshield before impact, it may directly show the driver looking down at a device or holding a phone to their ear. Dashcams in vehicles that were adjacent to or following the at-fault vehicle may provide even clearer footage of the driver's in-vehicle behavior.

Witness Accounts

Witnesses who observed the at-fault driver in the moments before the crash — looking down repeatedly, holding a device to their face, appearing inattentive to the road — provide admissible eyewitness testimony of distraction. Witness accounts are most powerful when collected immediately after the accident, before witnesses leave the scene. Even a vague account ("the driver seemed distracted" or "I saw them looking down") becomes the foundation for more specific exploration in deposition.

Social Media Activity Logs

Applications maintain their own logs of user activity — when the app was open, when the user posted, when the user scrolled or interacted with content. A social media post timestamped within seconds of the accident can be recovered from the platform's servers and the user's account data in civil discovery. These records can be more precise than carrier records for establishing the exact application the driver was using and the precise activity they were engaged in at the moment of impact.

The Driver's Admissions

At the accident scene, distracted drivers sometimes admit to being on their phone — "I'm so sorry, I was just checking a message." These admissions, documented in the police report or through witness accounts, are party admissions admissible in civil litigation and eliminate the need to prove phone use through records. Even partial admissions — "I didn't see you" without explanation — open the door for exploration of why the driver failed to see an otherwise visible hazard.