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T-mobile Data breach and sim swapping scam

Huh? To swap sim cards doesn't a new card have to be inserted ?
yes....this is from the article:
Regardless whether you're a T-Mobile user, the exposure of account PINs is a major danger. That's the password that you're asked to give to a T-Mobile employee before any changes can be made to your account. A scammer who knows your account password can call customer care and ask to have the SIM card linked to your phone number changed to a new SIM card and device, effectively taking over your phone number.
 
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