23. What happens when cell phone (device and SIM) is stolen, and SIM is still not deactivated.

Case when cell phone (device and SIM) is stolen, and SIM is still not deactivated.

In that case bad guy (hacker) will be able to access service (application) if he can unlock the phone (face id, fingerprint, passcode). But of course, real user should deactivate SIM as soon as possible. Deactivation of SIM card is enough to protect any further access to service.