Unfortunately, apps can occasionally crash, turn off on their own, or freeze. Sometimes in such cases it is difficult to simply reopen the application to make it function normally. It is then a good idea to go to App Switcher and turn off the app. Similarly, if your iPhone is slower than usual, it may be due to the number of apps running in the background. So if you’d like to find out how to get a list of all the apps that are opened in the background and how to disable them all, we recommend you to read this article.