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One of my friends was absolutely amazed when I told her that her phone could be used as a quite decent MP3 player. She noted that it would be one less thing she’d have to carry in her purse.
You can do this with smartphones (iphone, Android, Blackberry, etc.) and many other phones. It’s easiest if the phone has a standard 3.5 mm. mini jack, but can be used with other phones with the appropriate adapter.