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Thanks to iTunes, you can purchase and download custom ringtones for your iPhone. You can use one ringtone as your generic ringtone for all incoming calls, or you can assign specific ringtones to individual people.
To shop for ringtones, launch the iTunes app from your iPhone. At the bottom of the iTunes screen, tap on the More (...) icon. When the More screen appears, tap on the Ringtones option and start shopping.
When you purchase and download a new ringtone, it will become available on your iPhone’s internal ringtones list. Most ringtones from the iTunes Store cost $1.29 each. However, it is possible to create your own ringtones on a computer and then send them to your iPhone using the iTunes Sync process.