Bypassing Phone Security through Social Engineering
Khan was arrested in mid-July 2015. Undercover police officers posing as company managers arrived at his workplace and asked to check his driver and work records, according to the source. When they disputed where he was on a particular day, he got out his iPhone and showed them the record of his work.
The undercover officers asked to see his iPhone and Khan handed it over. After that, he was arrested. British police had 30 seconds to change the password settings to keep the phone open.
Reminds me about how the FBI arrested Ross William Ulbricht:
The agents had tailed him, waiting for the 29-year-old to open his computer and enter his passwords before swooping in.
That also works.
And, yes, I understand that none of this would have worked with the already dead Syed Farook and his iPhone.