Have you actually witnessed/dealt with an SMS swap/clone incident?

I worked for a mobile Telco for years, and you get the odd call through saying 'I think my SIM has been hacked/cloned', and I was in customer service and relatively not that technical at the time, and I used to dismiss a lot of these customers as tin hatters/a bit self absorbed (if their query had no grounding, there were semi-genuine incidents when for example sharing the same iCloud account with family or bought second hand with an un-wiped …

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