A few months ago, Charlie replaced his iPhone with a new one, and the kids thought that meant they could have his old phone which he'd stashed away somewhere. When they found the old phone, they probably felt like they'd just won the lottery - and thought they'd try to crack the security passcode.
I only figured out what had happened when William asked if I could let him use a calculator.
This was a fun little math project for us to work on together. Although probably more fun for me and Charlie, than the children.
We calculated that the phone will be unlocked in approximately 45 years ... or around the same time they may be planning to retire.
Suffice to say, they're very, very upset with Siri.