You can find general information about how you can control your privacy on iOS devices by visiting Apple's support site, here:
You can also disable tracking for advertising purposes across all apps, or on an app-by-app basis. It's important to be aware that this setting will not disable adverts in your apps, but it will mean you will receive generic adverts and your data will not be used to target ads specifically to you. For more information on this, and for instructions how to change these settings, please visit Apple’s support page here:
Google allows you to stop your data being used to personalise adverts across all apps. As with the equivalent setting on iOS, you should be aware that this setting will not disable adverts in your apps, but it will mean your data will not be used to target ads specifically to you For instructions on how to do this, visit Google's support page linked below, and refer to the section titled "Opt you out of personalised ads in services where cookie technology may not be available"
Samsung have provided instructions on how to adjust the privacy controls on Samsung Galaxy devices. For more information, please visit the page link below:
You can control data collection on Kindle Fire devices by visiting your device's settings menu, then selecting "Security and Privacy". Amazon provide more information on Privacy when using Amazon devices here: