A group of hackers claims to have hacked into systems belonging to the US division of mobile carrier T-Mobile, and is offering to sell the data and documents it has stolen to the highest bidder.

“We have everything, their databases, confidental [sic] documents, scripts and programs from their servers, financial documents up to 2009,” the group said in an email sent to various security news sources, which you can read here.

“We already contacted with [sic] their competitors and they didn’t show interest in buying their data – probably because the mails got to the wrong people – so now we are offering them for the highest bidder,” the email added.

German IT security consultancy Sunnet Beskerming commented on its website that there were suggestions that the offer could be a scam, including the fact that the group is trying to sell the data via an unsolicited email, a risky tactic.

And although it added that the level of detail in the email, which lists the names of various databases that the group claims to have accessed, suggests some familiarity with T-Mobile systems, "it is considered much more likely that it is a hoax,” Sunnet Beskerming said.

T-Mobile has yet to comment on the story.