Britain’s tax collection agency asked a contractor to use the SS7 mobile phone signalling protocol that would make available location data of alleged tax defaulters, a High Court lawsuit has revealed. Her Majesty’s Revenue and Customs had the potential to use SS7 to silently request that tax debtors’ mobile phones give up location data over the past six years, according to papers filed in an obscure court case about a contract dispute.

Read full article on The Register