Resources you can use to learn about phone security.
Investigators are exposed to many potential threats – from governments, private companies, organised groups – in the course of their work.
There are, therefore, dangers to be aware of and necessary security measures to be taken if you decide to communicate by mobile phone. An easy-to-spy-on device – as exposed during the Prism scandal - phones can indeed tell on you and your sources.
Tactical Tech has produced a number of resources you can use to learn about phone security.
Finally, have a look at the Guardian Project's website, created by a group of activists dedicated to creating open source apps to increase security and privacy on smartphones.