Even if a message appears to warn us that deleting the app will also delete the data, this usually only means that the data will be deleted from the device itself; it still exists on the developer’s server.If you want to delete all of the information that an app has saved on your iPhone or iPad, deleting the app will do the trick. You can reinstall the app again if you’d like, which would give you a fresh start.
This won’t work for most Apple apps that come preinstalled on your iPhone or iPad, as they typically cannot be deleted. 
What happens to my data when I uninstall the app?
When uninstalling the app, the data is deleted from the app-allocated space automatically, but not from the public folders, like Pictures/Instagram for instance. When uninstalling the app, you don’t actually delete/stop your account at the service – you are just removing an entry point to it.
Does an app delete everything on your phone?
On server NO and on your phone depends on the type of app. Like watsapp might not delete your images, folders or your data but deletes data not related to you. An app which doesn’t require any folders or data can delete itself completely from your phone.
How to uninstall apps on Android devices?
Tap the trash can icon, and select “Uninstall” to delete the apps.  The third option is to uninstall apps through the app drawer. This is a quick and easy option that works for apps both on the home screen and in the drawer. Tap and hold the apps you want to get rid of and drag them to the “Uninstall” area that will pop up on the screen.
What happens to WhatsApp messages when you uninstall the app?
WhatsApp stores data only on your phone (if it’s not backed up). However, Facebook Messenger, Gmail, and similar apps sync them to the cloud storage. So even if you clear data or uninstall the app, your messages or contacts will not be deleted. However, you will be logged out.
Hello Friends, this blog is maintained by MiChi. The name is derived from two names which we don’t want to reveal here. At Generation Axis our main focus is to discover and write all about technology, apps, gadgets and more. Our love for technology is increasing day-by-day and so the quality of our content. Please feel free to share your views.