Leaked documents show NSA can access data on iPhones, Blackberry and Android devices. NSA has set up teams to specialize in cracking each operating system. Spying on Smartphones has not been a mass surveillance operation and the tactic was only used on specific individuals and was done without the knowledge of smart phone companies. If you want to avoid this issue, either don’t be a terrorist or don’t use an iPhone, Android or Blackberry. No phone is safe. The NSA has successfully accessed BlackBerry email data, previously thought to be very secure.
Source: https://thehackernews.com/2013/09/nsa-can-access-your-data-on-smartphones.html