Wireless phone giant T-Mobile said today it is investigating claims that hackers have broken in and stolen customer data and company proprietary information. On Saturday, June 6, someone anonymously posted to the Full Disclosure security mailing list claims that a broad range of internal T-Mobile data had been compromised and was being put up for sale to the highest bidder. “We have everything, their databases, confidental [sic] documents, scripts and programs from their servers, financial documents up to 2009. We already contacted with 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.