If you’ve purchased lots of music through the iTunes store your iOS Music app will show you all of your purchases, even if they are not on your iPhone. And if you are an iTunes Match customer, you’ll see your entire music library.This is a really great feature because you can stream your music rather than allow it to consume valuable storage space. But if you are not near internet service (on the plane, when traveling) or if your monthly data allotment is running dry, you may want to only browse the music that is actually stored on your device. To do that, go to the Settings app > Music, then unselect “Show All Music”. When you’re ready to get your whole library back just flip the setting back on.