One of the newest features of Garage Band on your iPhone is the ability to create and save custom ringtones for your iPhone or iPad on those devices.

Here's how it works:

First, create your jingle in GarageBand. You'll want your tune to be no longer than 30 seconds; otherwise, GarageBand will automatically truncate your tune at the 30-second mark anyway. If your song is shorter, your ringtone will play it as a loop.

Once you're happy with your new song, tap to go back into your My Songs list of recordings. (On the iPhone, tap the disclosure triangle at the upper left to find My Songs; on the iPad, just tap the My Songs button.) From the My Songs list, tap and hold on your recording, or tap the Edit button at the upper right; your songs will start jiggling like homescreen icons you're rearranging. Tap to select your song if necessary, and then tap the Share icon at the upper left.

Scroll down in the subsequent screen and choose Ringtone (the only option under Share Song As). On the Export Ringtone screen, provide a name for your jingle.

When you continue, GarageBandshould tell you that the ringtone was successfully exported and also that a backup of your song will be available via iTunes File Sharing. If you tap OK, you can find the ringtone in your iOS device's sound settings, but GarageBand offers up a shortcut: the Use Sounds As button.

Tap that, and you can select whether to use your freshly-recorded song as a Standard Ringtone, Standard Text Tone (for SMS and iMessage notifications, new email alerts, or anything else that can sound a system notification of some sort), or choose to Assign it to a specific contact. (If you go that last route, you still get to select whether to use the song as a ring- or text tone after choosing which contact to assign it to.)