This isn't the first time T-Mobile has faced litigation over its alleged breach in its duty of care over customer data.
The plaintiff lost 15 bitcoin after an interaction with a T-Mobile customer who had been victim of a SIM-swapping attack.
A cryptocurrency-focused law firm in the U.S. says it has filed lawsuits against AT&T and T-Mobile on behalf of victims of "SIM swapping" hacks.
T-Mobile has entered the blockchain space and it's using Hyperledger technology as a way to rebuild its services on open-source software.