Most of us realize that our cell phones track our location minute-by-minute and that information is available to the cell phone company, to many web sites, to law enforcement agencies, and to hackers around the world who manage to access the various web sites. (See my earlier articles at http://bit.ly/2rUT3lF and http://bit.ly/2sPEAMe for details.) However, that is just the tip of the iceberg.
An article by Brad Jones in the Make Use Of web site details lots of privacy-invasive information being shared by your cell phone. Take a look at: http://www.makeuseof.com/tag/iphone-tracking.