He added that, given the complexity of running a major telecom business and the difficulty in keeping data secure, he was surprised the public did not see more major breaches more often. “The security programs most companies have are just struggling to keep up,” Daniel Miessler, an information security expert and tech writer in San Francisco, said in an interview. Large financial companies face hundreds of thousands of cyberattacks every day, and sometimes fail to stop them. Recent cyberattacks around the world have taken down operations at gasoline pipelines, hospitals and grocery chains, and have potentially compromised some intelligence agencies. Experts repeated concerns on Wednesday that, more and more, companies and institutions do not have the necessary security protocols in place to protect sensitive information. The breach was just one of many cracks in cybersecurity across multiple industries exposed in recent years.

T-Mobile did not immediately respond to questions about updates to its security systems. In response to the breach, the company said it would offer two years of free identity protection services. In 2019, the company’s email vendor was hacked, revealing some customer and employee personal information. In 2018, T-Mobile suffered a security breach that compromised personal information of as many as two million customers, including phone numbers, email addresses and account numbers. T-Mobile, like other major corporations, has struggled to stave off hackers and prevent data breaches. The mobile company confirmed on Tuesday that customer data was affected. T-Mobile announced it was investigating claims that data was “illegally accessed” on Monday, a day after Vice reported that a vendor in an online forum was trying to sell $270,000 worth of stolen information obtained from T-Mobile servers.

The company said it had “immediately closed” the access point in its computer system that it believed was targeted by the cyberattack. T-Mobile said that no phone numbers, account numbers or passwords were compromised for current or prospective customers, and that there was no indication that financial, credit card or other payment information had been stolen. It added that it would create a website to “help customers take steps to further protect themselves.” The company said it would reset PINs for those prepaid customers, and urged other customers to change their PINs as well.

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