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Maggie Hassan (D-N.H.) alleges that Trump Mobile failed to secure required authorizations for its international calling service and did not submit a complete plan to combat robocalls.
The senator wrote in a letter to the company that these oversights raise significant concerns about the security of the mobile service.
The letter highlights a recent report that hackers stole personal data from 3,615 Trump Mobile customers.
This incident follows a previous confirmation by the company that a vendor it uses exposed customer personal data on the Internet.
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