Apple iPhone OS 3.1 - Manual (Page 160)

iTunes Store
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About the iTunes Store
You can search for, browse, preview, purchase, and download music, ringtones,
audiobooks, TV shows, movies, and music videos from the iTunes Store directly to
iPhone. You can listen to audio or watch video podcasts from the iTunes Store, either
by streaming them from the Internet or by downloading them directly to iPhone.
Note: The iTunes Store is not available in all regions, and iTunes Store content may
vary across regions.
To access the iTunes Store, iPhone must be connected to the Internet. See “Connecting
to the Internet” on page 40.
To purchase songs or write reviews, you need an iTunes Store account. By default,
iPhone gets your iTunes Store account settings from iTunes. If you don’t have an iTunes
Store account, or if you want to make purchases from another iTunes Store account,
go to Settings > Store. See “Store” on page 159.
You don’t need an iTunes Store account to play or download podcasts.
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