All Breaches
August 16, 2021 Verified Telecommunications / Wireless Carrier

T-Mobile Data Breach

In August 2021, telecommunications giant T-Mobile suffered a massive data breach following the compromise of an unprotected testing server gateway.

76.6 Million
Reported Records
7
Data Types
Critical
Severity
Oct 20, 2026
Last updated

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Exposed Data Types

7
  • Full names
  • Social security numbers
  • Dates of birth
  • Driver's license numbers and state ID cards
  • T-Mobile account PINs
  • Phone numbers
  • IMEI and IMSI hardware identifiers

About This Breach

An attacker accessed production databases containing records of approximately 76.6 million current, former, and prospective customers. Compromised data included full names, Social security numbers (SSNs), dates of birth, driver's license numbers, account security PINs, and phone numbers. T-Mobile subsequently agreed to a $350 million class-action settlement alongside committing $150 million to strengthen customer data protection and network infrastructure.

Verification and editorial method

LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.

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