Confidential data on 30 million German phone users could be consulted on the Internet as a result of an error until the phone company locked access, a spokesman for Deutsche Telekom said Saturday.

Confirming a report in Monday’s edition of the magazine Der Spiegel, the spokesman said on Thursday and Friday the company, Europe’s leading telecommunications firm, had managed to secure the data — including bank accounts — relating to its clients.

The data had been accessible and easy to manipulate, he said. The company had no indication of a possible theft of the information.