Public charging points and cables: what is safe and what is not
Public USB charging points can be misused to steal data or install malware. Learn safer ways to charge at stations and airports.
A free USB charging point at a station or a cafe is tempting when your battery is nearly flat. A tampered port or cable can try to move data or push software to a phone that is connected. This risk is rare, but the fix is easy. Use your own charger, your own cable and a plain wall socket.
Steps
- Carry your own charger and cable. Keep a charger and a good cable in your bag. A wall socket gives only power, so there is no data route to worry about. This is the simplest and best habit.
- Avoid unknown USB ports and borrowed cables. Do not plug into a bare USB port at a public kiosk, or use a cable given to you by a stranger. Cables can hide extra electronics. Buy cables from a trusted shop.
- Use a power bank. A power bank in your bag lets you charge without any public port. Charge the bank at home and use it on the road, especially on long journeys.
- Choose Charge only if asked. If your phone shows a prompt about USB use after you connect, pick Charge only or No data transfer. Menu names differ slightly on Samsung, Xiaomi, Vivo, Oppo, Realme and OnePlus phones.
- Do not unlock or approve prompts. If a computer or port asks to trust this device or allow file access, say no unless it is your own device. A pure charger will never ask for that.
- Watch your phone while it charges. Do not leave it unattended at a public point. Charging stations are also places where phones get taken. Stay near it, or keep it in your hand.
Menu names differ a little between phone makers and Android versions. If you cannot find a setting, open Settings and use the search box.
Why it matters
Most people will never meet a booby-trapped charging port, but the habit costs almost nothing and also protects you from poor-quality chargers that overheat and damage batteries. It keeps your phone in your hands, rather than in a public place where somebody else can touch it. For a long trip, a power bank is a cheap and sensible habit.
Watch out for
- A prompt to trust a device while charging is a warning.
- Cheap unbranded chargers can damage a battery.
- Do not leave the phone alone at a charging kiosk.
- Do not accept a charger from a stranger.
How Safeavio helps
Safeavio's Guard my phone can sound a siren if the phone is picked up and carried away after you put it down, which helps at a charging point. Its phone scan reviews installed apps and risky settings. It cannot detect a bad cable and cannot make a public port safe.
Check it before you tap or pay
Safeavio Sentinel is a made-in-India Android app: paste a message or link, or scan a QR code, and get a plain verdict with the reasons. It helps you spot a scam; it does not promise to stop every one.
Download for AndroidWhat the app does
Google Play listing: coming soon. Today the signed APK is on safeavio.com/download. Android 7.0 or later.
Questions
Is charging in a train socket safe?
A normal power socket with your own charger is fine because it carries only power. The doubt is about bare USB ports and unknown cables. Use your own adaptor and cable, and stay with the phone.
What is a charge-only cable or data blocker?
It is a cable or small adaptor with the data wires removed, so it can only carry power. It is a cheap extra for frequent travellers, but your own charger in a wall socket does the same job.