The Real Risk of Answering Calls While Driving

Distraction-affected crashes killed 3,208 people in the U.S. in 2024, and cell phone use is one of the most common causes. Answering an unknown call while driving — including the reflexive "it might be important" answer to a spam or telemarketing call — is one of the most ordinary, least-discussed versions of this risk, precisely because it doesn't feel like a decision. The phone rings, and most people just answer.

What the research actually shows

The National Highway Traffic Safety Administration found that 68% of drivers aged 18-20 say they're willing to answer an incoming phone call while driving — the highest self-reported rate of any age group, alongside the highest rate of self-reported crash and near-crash experiences. Separately, University of Iowa researchers found that even hands-free phone conversations measurably slow how quickly a driver's eyes move to a new hazard, because the distraction is cognitive, not just physical — holding the phone isn't the only problem.

None of this requires texting or scrolling. Simply being in a phone conversation — including one you didn't choose to start — pulls attention away from the road in a way that's been measured directly.

Why spam and scam calls make this worse

An ordinary phone call from someone you know is at least a call you decided to have. Spam and scam calls are different: they arrive unpredictably, often in short repeated bursts from different numbers, and frequently use spoofed caller IDs designed to look urgent — a supposed bank alert, a "final notice," a number that looks local. That combination of unpredictable timing and manufactured urgency makes a driver more likely to answer reflexively, right when full attention matters most. To understand why numbers receive such intense bursts in the first place, read why spam calls happen in waves.

One customer described this to our team directly: they said a stretch of persistent unknown-number calls while driving to work contributed to a serious accident that left them permanently disabled. We can't independently verify the specifics of what happened that day — it's one account, shared after the fact, and we're not presenting it as a documented case study. But it's a sobering illustration of something the broader data already shows: the moment you reach for the phone is a moment your eyes and attention leave the road, and it doesn't take texting or scrolling for that to matter.

What actually reduces this risk

• Let the phone handle unknown numbers, not your attention. The fewer unknown or spam calls that ring through while you're driving, the fewer moments you're tempted to check who it is.
• Set your phone to silence unknown callers while driving, whether through your phone's built-in driving mode or on-device call screening that filters spam and scam numbers before they ring at all.
• Treat every unknown call the same way while driving: let it go to voicemail. If it's real and important, they'll leave a message or call back.

Callro's 26-Layer Gauntlet Engine (explore Callro features) evaluates incoming calls on-device through 26 layers of verification — including STIR/SHAKEN cryptographic attestation, behavioral dialing patterns, and number reputation — to drop fraudulent calls before your ringer sounds. While it isn't a substitute for the basic habit of not answering unknown calls at the wheel, it cuts down how often that decision comes up in the first place.