If you are an Android user, you can change the ringtone in the Settings menu. Simply swipe the top of the home screen to bring up the menu. Next, tap the icon that says Add New Ringtone. You'll be prompted to select the new ringtone, then choose OK. Your phone will now have the ringtone you want.
Another option is to use ringtone maker app on Android. This will allow you to select an appropriate ringtone file and have it play. You can even upload your own ringtone, which will be stored on your device. If you are not comfortable downloading the ringtone from the internet, you can also use a free ringtone maker app.