Unless you've been living under a rock, you know Apple has released two new iPhones. With much less fanfare, new Android and Windows Phone smartphones enter the market regularly.

So you decide it's time to put down your hard-earned money on one of these latest and greatest gadgets. But what do you do with your old smartphone? Well, you can always sell it and make some of your money back.

There are other options. A smartphone is basically a portable computer, and you can program it to do plenty of other things.

First, however, you need to turn off cellular data. Otherwise, your phone will drain your battery trying to find a signal. On an iPhone, go to Settings>>Cellular. For an iPad, it's Settings>>Cellular Data. Turn Cellular Data off.

In Android, swipe down from the top of the screen and look for the Mobile Data icon. You also might have a widget on your home screen.

Otherwise, go to Settings and under Wireless and Network, tap More Settings>>Mobile networks and uncheck Mobile data. The steps could vary by manufacturer, so check your manual if this doesn't work for you.

On a Windows Phone, go to the App list and go to Settings>>Cellular. Turn Data connection to Off. Make sure "For limited Wi-Fi connectivity" is set to "Don't use cellular data."

Now it's time to turn it into something else. The easiest option is a portable media player.