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>(SIM card transfer via social engineering)

How exactly does this happen?

Impersonate as the client of the phone company and request a new SIM card under the pretense that your current SIM card was stolen/lost.

Or bribe company staff to give you the SIM card.

Phone company staff are error-prone humans just like you and me who in general don't earn well enough for their responsibilities.

Aha! I'm an idiot; I thought this referred to social engineering of the person who owns the handset/SIM, not phone company staff.

That makes a lot more sense. Thanks!