Is it safe to use public USB charging stations for your phone?

USB cables carry both power and data simultaneously. When you plug your phone into a standard USB port — whether a cable or a charging station — you create a potential data connection in addition to the power connection. This is by design for normal charging, but it means that a malicious actor who controls the charging hardware could attempt to interact with your device.

Juice jacking is the name for attacks that exploit public charging infrastructure. It requires that the charging port or cable is compromised by a malicious party, that your device does not have appropriate protections, and that your device accepts the connection. Modern devices have protections — iOS and Android both prompt you to trust a connected device before allowing data exchange — but older devices or user habits (tapping 'trust' without reading) reduce this protection.

The practical risk is low in most countries with regulated public infrastructure. However, charging stations in less-regulated environments, hotel rooms with unusual USB ports, or informal street-level charging points present higher risk.

The simplest mitigation: carry your own charger and use standard AC wall outlets. If you must use a USB port, carry a USB data blocker (a small pass-through device that allows power but blocks data lines) — these cost a few pounds or dollars and eliminate the juice jacking risk entirely.