Following last week's hack of Experian -- the credit agency used by T-Mobile to handle applicant's credit checks -- customer details are now up for sale on the so-called Dark Web.

Irish fraud prevention firm Trustev has spotted customer details up for sale for as little as a dollar, according to VentureBeat. The Dark Web -- sometimes called the Deep Web -- refers to a set of websites with hidden IP addresses that can't be found with a regular browser search.

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The data breach at Experian -- the largest global credit agency -- was revealed on Thursday. Up to 15 million T-Mobile US Inc. customers could be at risk because of the hack. This includes new applicants and other customers that required a credit check between September 1, 2013, and September 16 this year.

Not surprisingly, T-Mobile's CEO, John Legere, said he was "incredibly angry" about the breach over the weekend, as the Financial Times reported. The "un-carrier" is reportedly considering cancelling its contract with Experian.

— Dan Jones, Mobile Editor, Light Reading