iPhone users may want to take heed of a hidden setting in the privacy section of devices that turns off the ability for apps to track your activity, the Daily Star reports. With each phone given a unique advertising ID, apps are able to track your activity across the internet and other apps.
This allows apps to keep an eye on your online activity and tailor personalised ads based on your habits. They build a picture of your personality, lifestyle, what you buy and even your political beliefs.
The downside – and certainly more sinister – of this is that many apps sell this data on to other companies. But you can take steps to avoid this.
