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.
HTH.
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