© Reuters.

Silver Miller. a cryptocurrency-focused law firm based in the U.S., says it has filed arbitration claims against AT&T (NYSE:) and T-Mobile on behalf of victims of “SIM swapping” cellphone hacks.

Initiating the court actions on behalf of clients that have lost funds to criminals that used the increasingly common method of infiltrating mobile devices to access cryptocurrency wallets and two-factor authentication codes, the firm alleges:

“By leaving holes in their security protocols and failing to properly train and monitor their employees, cellphone providers have assisted thieves in remotely taking over the SIM cards in people’s smartphones, accessing financial records and account information of the victims, and emptying the victim’s accounts of cryptocurrency and other valuable assets.”

In a press release published Friday, Silver Miller said that one client, an AT&T customer, had had over $621,000 of cryptocurrency stolen via a SIM swap attack. The firm further alleges that the breach occurred after AT&T “had assured him it had increased security on his account following an earlier attempted hack.”

Other cases have been filed against T-Mobile, with Silver Miller alleging that two clients had been robbed of $400,000 and $250,000, respectively, via SIM swaps “permitted” by the telcom firm.

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