Illustration: The Verge

Google has notified customers using its Google Fi cell service that their personal data may have been stolen in a recent cyberattack, which is believed to be in connection with a T-Mobile data breach earlier this month. In an email sent to Google Fi customers on Monday, obtained by Android Police, Google said that the cell network’s primary network provider had become aware of suspicious activity in a system containing Google Fi customer data.

Google Fi is an MVNO that uses T-Mobile’s network for the majority of its connections alongside US Cellular, but Google doesn’t explicitly name T-Mobile as its primary service provider within the email. We have reached out to Google for clarification and will update this story should we hear back.

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