How to Convert a Smartphone Into a Dashcam Safely

Rules for windshield mounts and phone interaction vary by state. The device must not obstruct vision, and you should configure it while parked rather than touch it while driving.

Use a secure mount, continuous compatible power, enough storage and a reputable loop-recording app. Test that recording restarts as expected before relying on it.

Video recording, charging and direct sun can create heat, which accelerates battery wear and may trigger shutdown. Never use a swollen or damaged battery.

It can only do so while adequately powered and within safe temperature limits. Leaving a phone visible in a parked car also creates theft and heat risks.

It may be useful, but preserve the original file and metadata. Evidentiary treatment depends on the jurisdiction and circumstances.