Resumen
If your smartphone has a GPS, your provider knows exactly where you are and where you have been as well as who you have contacted. In addition, tracking software which logs where you have been and what you did has been previously found on Apple's iPhone and just recently, Carrier IQ tracking software has been acknowledged to be on over 150 million smartphones. If this is combined with a recent government directive that no warrant is needed to access this information, then if you have a smartphone, you really have zero privacy.