[naranha]

There is a large button underneath the number pad where you enter your PIN and it says Emergency Call. It works even when the SIM is still locked.

[Aachen]

Ah, right yes that makes sense. I don't want to bother with entering a password on a device I use dozens of times a day so never set one, that explains why I don't see such a button: people can just get to the dialer if they need to call a number while I'm incapacitated