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Suspects can refuse to provide phone passcodes to police, court rules
(arstechnica.com)
This is a most excellent place for technology news and articles.
On iPhone, tap the power button five times quickly
Or squeeze volume up button and power button. Encrypts your data and requires passcode unlock. Also, set a long passcode like 10 digits. 4 can be cracked in minutes. 6 can be cracked in a few hours.
Don’t hold them down for too long though or it automatically calls the emergency services!