How to Download Ringtones Directly to an iPhoneby Amanda Gronot ; Updated September 28, 2017
If you don't want to sync your iPhone with iTunes every time you get a new ringtone, you can opt to download ringtones directly to your phone instead. The iPhone comes with an "iTunes Store" app that allows you to access any part of the iTunes Store, including the ringtone library, directly from your phone. When you find a ringtone that you like, you can simply tap the "Buy" button and the ringtone will download right into your phone's ringtone folder, which you can access through "Settings."
Tap the "iTunes" app on your iPhone’s home screen.
Tap "More" in the bottom row of buttons and then tap "Ringtones."
Browse music by featured, top ten lists or genres. Tap an album, artist or a top-ten list to view a list of songs.
Tap the price button next to the ringtone you want to purchase. Make sure a bell-shaped symbol appears next to it – this indicates that the song is a ringtone. The button turns green and displays "Buy Now." Tap this button again. Enter your Apple ID and password in the blue box that appears and tap "OK."
Tap "Settings," "Sounds" and then "Ringtones" to set your new ringtone.