By Taniya Harwell |Staff Writer| American and British spies hacked into the network of Gemalto, the largest manufacturer of cellphone SIM cards in the world, according to top-secret documents revealed by National Security Agency (NSA) whistleblower Edward Snowden. The hack was a joint venture consisting of NSA operatives and its British counterpart Government Communications Headquarters (GCHQ). It gave the surveillance agencies the potential to secretly monitor a large portion of the world’s cellular communications, including both voice activity and data. It is unknown what the agencies have done with the data. This information comes from a secret GCHQ document published … [Read more...] about Snowden reveals SIM card spying