1. The iPhone 7 system comes with ringtone settings:

Click on the phone settings - sound - ringtones, and then select the ringtone that needs to be changed.

2. Customize ringtones on iPhone 7:

1. Connect the phone to the computer, open "itunes", select "File" - "Add file to library" in the menu bar

2. Select the song you want to use as ringtone and click "Open"

3. The song will appear in "Music" in "Library". Right-click the song and select "Show" Introduction" (Be sure to click on the song option and not the album option, otherwise acc creation will not appear)

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

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

6. A file with the same file name but within 40 seconds appears

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7. Right-click the newly created song, select "Show in Windows Explorer", change the "m4a" format to "m4r", and select "Yes" in the pop-up window (File Settings Options You must check "Do not hide file types" or you cannot change the file type name)

8. Check: Find "Preferences" in "Edit" in the "itunes" menu bar and open it in "Common" - "Source" "Tick "Ringtones" and then "OK"

9. You can see "Ringtones" in the "Library". Open "Ringtones" and you can see whether your file has been Convert to ringtone

10. Then open "iphone" in "Devices" and select "Ringtones", check the "Sync Ringtones" item, select "All Ringtones" or "Selected Ringtones", and then select "Synchronize", then

11. After successfully synchronizing the "ringtone", the ringtone will appear in the phone's "Settings" - "Sounds" - "Ringtones" - "Customize". To use this ringtone, just Just choose.