Click the Settings icon on the phone's home page.

Go to the settings page and click "Sound and Vibration".

On the sound and vibration page, click "ringtone".

Select the ringtone you want to use, and then click OK.

Method 2:

Open the phone desktop and click the "File Management" icon.

Go to file management and click "Music".

Long press the music you want to set as ringtone.

Select "more->; Set as ringtone sets the ringtone as the incoming ringtone.

Method 3:

Open the dial-up interface and click the "Menu" icon in the upper right corner.

Select the call settings from the drop-down list.

Click "ringtone".

Select the ringtone you want to use, and then click OK.