How to Use Playlists on Your iPhone
You can use playlists on your iPhone just as you can on an iPod. To use playlists on your iPhone, tap the Playlists icon at the bottom of the screen; a list of playlists appears. If you don’t have any playlists on your iPhone, don’t sweat it. Just know that if you had some, this is where they’d be. (Playlists let you organize songs around a particular theme or mood: opera arias, romantic ballads, 1980s pop, songs you like to hear when you clean the kitchen, whatever.)
Tap a playlist and you see a list of the songs it contains. If the list is longer than one screen, flick upward to scroll down. Tap a song in the list and it plays.

iPhone Glossary
FaceTime
Apple software that enables users with supported mobile devices to both see and hear each other during wireless conversations.

iPhone Glossary
iCal
Apple’s personal calendar application.

iPhone Glossary
iCloud
Apple’s wireless storage and synchronization service that keeps digital information updated automatically and wirelessly without user instigation.

iPhone Glossary
iOS 5
The operating system for mobile Apple devices released in June, 2011. With iOS 5, data updates and synchronization occur wirelessly through the iCloud.

iPhone Glossary
jailbreak
Altering an electronic device to remove default restrictions imposed by the manufacturer.

iPhone Glossary
Siri
A voice-controlled personal assistant application purchased by Apple and available exclusively on the iPhone 4S.