Apple, Google, and Amazon all provide additional ways to block or limit purchases on your device.
We strongly encourage you to set these features up regardless of who has access to your device, and recommend using a password or passcode that is different to the one you use to unlock the device for extra security.
iOS / Apple
To set up these restrictions on iOS or Apple devices, please follow the guide on Apple's support site here: https://support.apple.com/en-gb/HT204396
Android / Google Play
To set up these restrictions on Android devices with the Google Play Store, please follow the instructions on Google's support site here: https://support.google.com/googleplay/answer/1626831
Amazon / Kindle
To block in-app purchases on Amazon devices such as the Kindle Fire, follow the steps on Amazon's support site here: https://www.amazon.com/gp/help/customer/display.html?nodeId=201357730