Advanced data usage settings
Two other settings available from the Menu icon can have dramatic effects, but may sometimes be useful:
Data roaming can result in steep additional charges. However, in some locations this may be the only way to
connect to the Internet.
Restrict background data affects all your apps across all available networks, and may cause some features to
stop working. This is an extreme step that should be used with caution.
Optimize memory usage
You typically don't need to worry about managing apps beyond installing, opening, and using them. But there may
be times when you want to know more about what's happening behind the scenes.
Apps use two kinds of memory: internal storage and RAM. They use internal storage for themselves and any files,
settings, and other data they use. They also use RAM (memory designed for temporary storage and fast access)
when they're running.
Android manages and carefully guards the portion of internal storage where the system, apps, and most data for
those apps are stored, because this area may contain your private information. It's not possible to view this portion
of internal storage when you connect your device to a computer with a USB cable. The other portion of internal
storage, where music, downloaded files, and so on are stored, remains visible for your convenience.
Android also manages how apps use RAM. It may cache some things you've been using recently, for quicker access if
you need them again, but it will erase the cache if it needs the RAM for new activities. You affect the way apps use
internal storage directly and indirectly in many ways; for example, by:
You rarely need to manage the way apps use RAM. But you can monitor apps' RAM usage and stop them if they
misbehave.
Use the Apps screen
ter via USB.
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