The public charging safety checklist

The guidance below follows what U.S. agencies actually recommend — the FBI's 2023 travel advisory (CNBC) and the FCC's standing consumer guide (FCC) — ordered by how much protection each habit buys you in practice. For the background risk, read our honest juice-jacking explainer.

1. Prefer a wall outlet with your own charger. An AC outlet plus your own adapter creates no USB data path at all. This is the FBI's and FCC's first recommendation — carry your own plug and cables when you travel.
2. Make the cable itself safe. If you'll ever use a USB port you don't control — airport kiosk, hotel lamp, seat-back port, rental car — carry hardware that cuts the data lines: a data blocker, a charge-only cable, or a switchable cable that disconnects data physically and shows its mode on a status light.
3. Carry a power bank. A charged battery pack means never needing an unknown port in the first place. Charge the bank at home or from an outlet, then charge your devices from the bank.
4. Never tap “Trust” at a public port. If your phone asks whether to trust the connected device or share data while charging in public, always choose “charge only” or “don't trust.” The prompt exists precisely because the other end is claiming to be a computer.
5. Treat rental cars as public ports. Car USB ports are computers with wheels: many infotainment systems request contacts and messages the moment you plug in. Charge in protected mode unless you deliberately want CarPlay or Android Auto.
6. Skip found or borrowed cables. A cable left in a port or handed to you is hardware you can't vouch for — malicious cables that look ordinary are commercially demonstrable. Use your own.
7. Keep devices updated. OS updates patch the USB-stack vulnerabilities that make silent attacks possible, shrinking what a hostile port can do even if a data path exists.

The one-sentence version

Charge from outlets and power banks when you can; when you must use a USB port you don't control, make sure the data lines physically can't connect — and never tap “trust” for a port.