T-Mobile Confirms Data Breach Impacting Customer Call Records
T-Mobile, now the third-largest U.S. wireless carrier following its $26 billion merger with Sprint, has disclosed its second significant data breach of 2020. The company revealed unauthorized access to certain customer account information in late December.
Key Details of the Breach
According to T-Mobile’s security notice, hackers accessed:
- Customer proprietary network information (CPNI)
- Call detail records including:
- Call timestamps
- Call duration
- Phone numbers involved in calls
- Other billing-related information
Important note: The company states the breach did not compromise:
- Customer names
- Physical or email addresses
- Financial information
- Account passwords or PINs
Scope and Response
- Timing: The breach occurred in early December 2020
- Impact: Approximately 200,000 customers (0.2% of T-Mobile’s user base)
- Response actions:
- Immediate investigation with cybersecurity forensics experts
- Notification of federal law enforcement
- Customer notification process initiated
T-Mobile’s Security Track Record
This incident continues a concerning pattern of security issues for the telecom giant:
- 2018: Up to 2 million customers affected by data scraping
- 2019: 1 million+ prepaid customer records exposed
- Early 2020: Employee email breach compromising customer data
Protecting Your Information
While T-Mobile states no financial data was accessed, customers should remain vigilant. Consider these security measures:
- Monitor account activity regularly
- Enable two-factor authentication
- Be alert for phishing attempts
- Review call detail records for unusual activity
For more cybersecurity tips, see our guide on protecting your phone number.
Article updated with additional comment from T-Mobile.
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