As of 2026, the power of customs officers to force you to unlock your phone varies significantly by country, but in the United States, Canada, and Australia, they have broad authorities. Under the "border search exception," U.S. Customs and Border Protection (CBP) can generally search electronic devices without a warrant. While they cannot physically "force" your finger onto a sensor, they can detain your device for weeks, mirror its contents, or deny entry to non-citizens who refuse to comply. In the UK and Australia, refusing to provide a passcode can result in criminal prosecution or heavy fines under specific "TOLRP" or "SCCA" laws. However, there are evolving legal protections regarding "cloud data"; in many jurisdictions, officers can only search what is physically stored on the device, not your remote Google Drive or iCloud, unless they obtain a separate warrant. To protect privacy, many international travelers in 2026 use "Travel Mode" on their devices or perform a full backup and wipe before crossing sensitive borders, reinstalling their data only after they have successfully cleared customs.