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Protection against unauthorized SIM SWAPPING (Sim Swap Attack)
I have NOT yet been a victim of a SIM SWAP attack but the ramifications are HUGE. As I understand it, my phone number can be hijacked to a device in the possession of the hijacker EVEN THOUGH I HAVE THE SIM IN MY PHONE IN MY HAND! Any 2FA text message authentication, text msgs, phone calls, etc. would then be sent to the hijacker's phone.
I wouldn't be able to place phone calls. Any interactions that I have with businesses, banks, etc. would not be able to verify my identity because I would not be able to phone in using MY phone number. My banking, etc would not let me log in because I would not be able to receive the text messages with the login codes that are required. etc etc.
In other words, if my phone is my identity and that identity is controlled by the SIM card in my phone and someone is able to use that SIM information for their own purposes, I am toast!
I do NOT understand exactly how anyone could hijack my number (SIM SWAP) unless ATT permitted it.
What mechanisms are in place to prevent this from happening? Is there some option in my account that I can set which will prevent this??