US spy agency 'collected 200 million texts a day'

It has been claimed that the National Security Agency in the US has collected up to 200 million text messages a day from across the world.

In a joint investigation by The Guardian Newspaper in the UK and Channel Four news, who have seen a classified April 2011 presentation which they say shows that the text messages were being used to gain access to details such as location, contact networks and credit card details.