"Apple has given you the ability to say, 'Do not track me, do not collect that data and do not sell it to anybody else,' " Lee said. "They have it installed in the phones so it's built-in, your ability to stop people from tracking what apps you use."
When you open an app for the first time on the new iOS, you might see a pop-up notification asking if it can collect your data. If you don't see the pop-up, the app is not worried about collecting your information.
"There will be a prompt in your apps asking, 'Do you want to allow this app to track you?' " said Thomas Germain, a tech editor at Consumer Reports. "If you say no, you're clear. That's all you need to do."