When you install any app you can get its update notification or sometime a lots of ads. IT happens commonly when you are installing free games or apps in your device. There is a option available through which you can stop the notification. Sony Xperia Z2 has a separate settings available for that. Through which you can stop notification coming from any app. For example playing a free game. You might get regular ads or some kind of offer in then notification pane. And when you tap on that it take to the Google Store or any other store to buy stuff. Another example is the mail or Facebook app. If you had added the account in the device and when a new mail come you will get the notification on device. This can be irritating sometime. In Xperia Z2 you can stop it permanently. But remember after turning it off you won't get any update notice also. You can get notification when you start the app. Updating the app is good for your device security. Outdated apps have security bugs that can cause issue with the device data.
Tap on Settings and then tap on Personalization.
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