If you recall there was a terrorist couple in California and after committing a heinous crime (14 dead I think) the US wanted to hack into their iPhone to find details of what contacts they had. It was 'impossible'. Apple refused to write software to enable the secity services from unlocking it; some Israeli company said they could do it, but I'm not sure if they succeeded. Certainly the FBI found a way in, but some common scrote would not be able to do that and when I wanted to unlock and old iPhone previously belonging to my child no-one could help me.
Just a pity Apple remain on the side of the terrorists rather than the law enforcers.