Social engineering.
> Hi, AT&T, I was at the bar last night and I lost my phone. I still have my old phone, though. Can you help me transfer it? Mother's maiden name? Why yes, it is on whitepages.com!
> Hi, AT&T, I was at the bar last night and I lost my phone. I still have my old phone, though. Can you help me transfer it? Mother's maiden name? Why yes, it is on whitepages.com!
Sorry for the delay in answering, “Social Engineering” is not hacking. Manipulating the SS7 protocols for nefarious ends, could be considered hacking.
https://blog.securegroup.com/phone-hacking-through-ss7-is-fr...