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Dev volume booster is a great app that helps you boost your phone volume. It's really easy to use and works like a charm. You can adjust the volume by sliding the button on the left side of the screen. You can also easily switch between speakers and headphones. The only thing we didn't like about this app is that it doesn't have a lot of features. But if you're looking for a simple app that will help you boost your phone volume, this is the one.Features: