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How a Hacker Allegedly Stole Millions by Hijacking Phone Numbers - Motherboard

https://motherboard.vice.com/en_us/article/a3q7mz/hacker-allegedly-stole-millions-bitcoin-sim-swapping

tricking a provider like AT&T into transferring the target’s phone number to a SIM card controlled by the criminal.

reset the victims’ passwords and break into their online accounts