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I would assume 90% of iPhone users if not more use 6 digit codes. So this is still a big win for the creators of GrayKey

90% of iPhone users with a passcode probably use the (default) 6 digit passcode option, but I would be surprised if that many people set that up.

The default is to create a passcode - you have to specifically opt out if you don't want one.

A huge percentage of people use stupid passcodes, because convenience is more important than security for them.

Six ones, or up and down the middle column, that sort of thing.

Guilty. Convenience is much more important than security for me.

Back in 2016, it was estimated between 85-89% used a passcode [0]; I expect it's probably even higher today.