T-Mobile USA is assuring its 33 million customers that their information and the company’s information is safe, following claims that the operator’s systems were hacked earlier this week.

A posting was made to the Full Disclosure security mailing list over the weekend in which the author claimed to have had access to T-Mobile USA’s network for “some time”.

“We have everything, their databases, confidental [sic] documents, scripts and programs from their servers, financial documents up to 2009,” the hackers said.

In the posting, the hackers, who did not identify themselves by any means other than a disposable email address, claimed to have contacted T-Mobile’s competitors with a view to selling the data. However, no one showed an interest, so the hackers are now offering the info to the highest bidder.

By way of proof, the hackers copied and pasted an extract from a database which appears to show information on various HP Unix, SunOS, and AIX boxes running a variety of applications on the T-Mobile network.

While T-Mobile has confirmed that the data is from one of its own documents, the company claims that it has found no evidence of the security compromise described by those claiming to have hacked the operator.

“The company is conducting a thorough investigation and at this time has found no evidence that customer information, or other company information, has been compromised,” T-Mobile said. “As is our standard practice, customers can be assured if there is any evidence that customer or system information has been compromised, we would inform those affected as quickly as possible.”