2. Transfer the audio file to the mobile phone. You can transfer files from your computer to your mobile phone through a USB connection, or download them directly to your mobile phone using a browser.
3. Open the setting menu of the mobile phone and find the option of "sound" or "ringtone".
4. In the sound or ringtone settings, you may see several different ringtone options, such as call ringtone and information ringtone. Select the ringtone type you want to change.
5. In the ringtone list, look at the existing ringtones and find an option called "Custom" or "Local Audio" or something similar. Enter this option.
6. In the custom ringtone option, select the audio file stored in the mobile phone, and find and select the previously downloaded and saved audio file "Night Rain in Lhasa".
7. After selecting the audio file, preview it to ensure that the audio file is the correct file you want to set as the ringing tone.
8. After confirming the selection, save the changes and exit the setup menu.