Hi @KireniaRt83
A MCK is a mastercode that is sometimes needed along with a Network Unlock Code NUC to unlock the phone to all Network's so it accounts any Network's Sim Card.
Your Network would usually supply the MCK.
Daily Driver > Samsung Galaxy s²⁴ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
