A USB data blocker or charge-only cable helps keep a charging session limited to power when you have to use an unfamiliar USB port. Modern phones already gate most USB data access, and real-world public “juice jacking” risk is usually low, so your own wall charger or power bank is still the better first choice. Treat this as a compact fallback when public USB charging is unavoidable.
Buying guidance:
Use makers with clear data-line-blocking claims and connector-specific variants, such as PortaPow, Plugable, or ChargeDefense. Avoid adapters that market this as broad malware protection; it is only a narrow power/data separation tool, and some USB-C fast-charging behavior may depend on the exact cable and blocker design.
What to look for:
- Clear support for the connector types you actually use
- A design that physically blocks data pins or omits data lines
- Compatibility with the charging speeds you need
- A small form factor you can keep in a travel pouch
- Separate marking from normal data cables so you grab the right one quickly