Re: getting a new iPhone, some help needed, please
OK, yeah, this should have been clearer from the start.
When you press the Home button, the app is typically suspended if it has nothing left to do, but continues using resources (like memory) until iOS requires them, at which point the app is killed. Apps are designed to write their state to disk when it changes and to respond to signals telling them they're being suspended, so that when they are killed there are no consequences. Because flash memory is fast, you barely notice this taking place.
There are exceptions to the rule that apps be suspended. Certain classes of apps, like music playback apps or GPS apps, can request permission to continue running in the background. Apps can also request more background time upon suspension, which means that they can finish some task that the user started, like a download. A maximum of 10 minutes can be requested in this way. There is also support for a native file downloader, which apps can signal their intent to use whi le in the background; iOS completes such downloads. Finally, apps can be spawned at opportune times while not actively in use, to refresh their state. You control which apps have this blessing in Settings, General, Background App Refresh. Such apps will hopefully be ready for you to use the moment you launch them.
Personally, I do as Dark does, and tidy up. There is no real need to do this, though, and unless you close an app that is running in the background (which effectively overrides the OS's decision to leave it running) it is really no different from allowing the OS to manage your resources. The only exception I've sometimes found is the case where an app, say a game, is particularly demanding on resources; in that case closing apps ahead of time can avoid some early crashes as the game tries and fails to allocate memory which it then does not handle. If you restart your device, every app that requires permission to run in the background will get it again and b e restarted, and will keep running until you explicitly terminate it again from the task switcher.
HTH.
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