How to remove a device from Find My iPhone
One of the marquee features of the Find My app is support for locating devices even when they are offline. As part of the privacy framework of Find My , however, there is one contingency. In order to unlock the location of a lost device, you must own another Apple device. This is because the second Apple product is the one that holds the key to decrypt the location of an offline device.
Each of your Apple devices emits a constantly changing key that nearby Apple devices pick up. Essentially, each device is turned into a beacon, and the devices all bounce off each other. A report from Wired earlier this year broke down how Find My will work in the real-world, while still preserving privacy:. When you tap a button to find your laptop, the iPad uploads the same hash of the public key to Apple as an identifier, so that Apple can search through its millions upon millions of stored encrypted locations, and find the matching hash.
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Do you need to erase your device? Here’s how to turn off Find My iPhone
The GPS part of the equation is strictly a private affair, done on the phone, by scanning then heavens for blips transmitted blindly from satellites. GPS alone cannot be used to track someone, despite what one million TV cop shows tell us. If they have an iPhone and an iPad, for example, you can make suer location is shared from the iPhone.
You can also choose which family members can see their location. In the case of a kid, you might want to let parents, and brothers and sisters all see the data.
Although this might make games of hide and seek rather short. The most obvious way to track your offspring is to open up the Find My Friends app. When you launch this app, it shows you a map, with pulsing dots showing the location of anyone who has allowed you to stalk them. You can also check locations from within the Messages app. If you do it in a shared thread, you will see everyone who has enabled location sharing from their own device. One day your child will lose their iPhone. Step one is to download the Find My iPhone app to your own device.