Iphone ios7 rejects SMS settings.

Settings-> Voice-> The telephone

Then you can choose to change

Custom ringtone settings:

1. Open itunes and select File-Add File to Library from the menu bar.

2. Select the song you want to ring, and then click Open.

This song will appear in the "Music Library". Right-click the song and select "Show Info".

4. Select "Options" and fill in "Start Time" and "Stop Time" (within 40 seconds)-"OK"

PS: iPhone ringtone should be within 40 seconds.

5. Right-click the song again and select "Create acc Version"

6. A file with the same file name but less than 40 seconds will appear.

7. Right-click the newly created song, select "Display in windows Explorer", change the format of "m4a" to "m4r", and select "Yes" in the pop-up window.

8. Check: Find "Preferences" in "Edit" of "itunes" menu bar, and turn on "Ringtone" in "Common"-"Signal Source".

Put a tick in the front and then "OK". You can see the "ringtone" in the "database". Turn on the "ringtone" and you can see whether your file has been turned into a ringtone.

9. Then turn on the iphone in the device, select the ringtone, check the item "Synchronize ringtones", select "All ringtones" or "Selected ringtones", and then select "Synchronize".

10, after successfully synchronizing the ringtone.

The ringtone will appear in the settings-sound-ringtone-custom of the mobile phone. To use this ringtone, just select it.

Hope to adopt!