The network belonging to T-Mobile in the US may have been completely cracked, if a new advertisement is anything to go by.

A group of hackers is offering to sell the entire corporate database of the German telecoms giant, stating that it has "everything", including databases, confidential scripts, programs from servers, operating data and financial records.

Making its comments on the Full Disclosure mailing list, the hackers said that it had offered the information elsewhere.

The group explained: "We already contacted 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.

"Please only serious offers, don't waste our time."

T-Mobile announced that a full investigation is currently underway and that the safety of its customers is paramount in its ethos as a company.

Last year, T-Mobile admitted to losing 17 million customer records in Germany, including credit card details, names and addresses.

More than half of small businesses (53 per cent) believe that the most important benefit of outsourcing is guaranteed response times for IT support. London-based Connect conducted the research in 2007.