As the security vulnerability  is revealed  in SIM cards, which are considered the powerful digital technology   for its ongoing health,  millions of  cell phones  are found under the threat. With 2billion smartphones there are more  than 3billion mobile devices in the world. The founder of German firm Security Research Labs  Carsten Nohl, who  carries  researches  for  mobile security  discovered   security vulnerability  in 25 % of  SIM cards across the  world .About 3 billion  DES-powered  SIM  cards  are susceptible to the hack. As result of investigation it is revealed that this vulnerability could allow hackers to take over mobile payments and  bank messages.