The government needs a 4th Amendment warrant (with probable cause) to get your cell phone location data.
Congress passed the Stored Communications Act to address a gap that the Fourth Amendment would not fill. The Stored Communications act protects personal info stored on electronic devices.
Can police search a motorcycle parked outside a home, covered almost fully by a tarp without a warrant?
Can you expect privacy (i.e. Fourth Amendment protections) in a rental car if you are not on the lease?