I'm using a Samsung phone and I recently got an anonymous message via Class 0 Message
Class 0 Message
URGENT MATTER ,CONTACT
ME MY EMAIL NOW
From: (phone no. redacted)
I saw a concerning article regarding the issue, it said that it can apparently reboot your phone? Is that true?
What I did was I responded to the email not knowing it might be a scam.
Important: if you factory reseted your device, pay much attention when installing apps again, check out apps are really trusted.