U.S. telecom firm T-Mobile said on Wednesday it had detected attempts in recent weeks by "bad actors" to infiltrate its systems but they did not access sensitive customer data.

The phone giant said hackers did not access the contents or logs of customer phone calls or text messages, during an industry-wide attack on phone and internet companies.

T-Mobile, a frequent victim of data breaches, recently revealed how it successfully thwarted a major cyberattack.