https://www.bleepingcomputer.com/news/security/google-fi-dat...
This article says that Google Fi customers were SIM swapped due to a T-Mobile breach. Even though "[t]here was no access to Google's systems or any systems overseen by Google."
This article says that Google Fi customers were SIM swapped due to a T-Mobile breach. Even though "[t]here was no access to Google's systems or any systems overseen by Google."
> As the Google Fi data breach includes phone numbers, which can easily be linked to a customer's name, and the serial number of SIM cards, it would have made it even more convincing when contacting a mobile customer support representative.
They used the data in the breach to social engineer the Google fi reps. Attackers still needed to get through Google’s customer support system to perform the SIM swaps.