One of the problems with smart phone is that spy agencies and advertisers can use them to collect data and keep tabs smartphone tracking on users.
The below infographic reveals that retail stores and hackers are equally interested in tracking and spying on smart devices including smartphones, although they have different agendas than spy agencies. It also gives you tips on how to protect you iPhone and Android phones from privacy invasion.
http://tfour.me/2014/11/who-is-tracking ... art-phone/