CTIA members of the Smartphone Anti-Theft Voluntary Committee have met their voluntary commitment to make antitheft tools available for free on all new mobile phones manufactured after July 2016 for sale in the US. This covers most of the phones that are manufactured for sale in the US.
The first phase of this commitm you ent plan called for the antitheft tools to be installed on all handsets offered for sale after July 2015 in the US. The second phase called for new handset models sold after July 2016 in the US to give authorized users the ability to disable the antitheft tools anytime they want to, as long as the device is still connected and still in the authorized user's possession.
So if you don't like being tracked by your cell phone the ability to turn off this feature is a big boon.
For more information from naked security on the subject click here.