Heard the Intel ME is equipped with a 3G capability for when all power off unplugged from internet.
https://hackaday.com/2017/12/11/what-you-need-to-know-about-the-intel-management-engine/
Intel is the world's most abusive, monopolistic tech company. Wouldnt embed sorry https://www.youtube.com/watch?time_continue=135&v=osSMJRyxG0k
Could it be MZ in pic from Q193 ?