I would like to ask about the ringtone of dopod 830 mobile phone.

Dude, dopod's cell phone rings like this. If you are outside, you'd better choose vibration and ringing, but you will still miss answering the phone. Modifying the registry is of little use. You can try to turn up the volume of the bell. You can search the adjustment method online, or visit the method of/wjxd/200606/t20060605 _ 481236.htm.