These are the steps to opt out of Verizon “selling your personal data”, as far as I can tell:
Visit http://www.vzw.com/myprivacy. If you are not already signed in to My Verizon, you will be prompted to sign in – after doing so, return to that myprivacy page.
You should now be at “Location Management” > “Location Privacy Settings”. I’m guessing that this is where you actually opt-out. I’m not sure because there’s nothing for me to do here – I see “There are no services available. A location service must be downloaded on the handset to be listed here.”.
Visit http://www.vzw.com/myprivacy. If you are not already signed in to My Verizon, you will be prompted to sign in – after doing so, return to that myprivacy page.
Click the link “Manage Location Privacy settings” near the bottom, which points to https://locationmanagement.vzw.com/
You should now be at “Location Management” > “Location Privacy Settings”. I’m guessing that this is where you actually opt-out. I’m not sure because there’s nothing for me to do here – I see “There are no services available. A location service must be downloaded on the handset to be listed here.”.