http://www.pathibhara.com/ringtones-palm-centro/

using a DS card, how can I use mp3s and make them ringtones on a Palm Centro?
Ugh, I know it’s kinda of pointless to have a phone like this without any internet, but I do. The one thing that I do have is a DS card. So, is there any way that I can import mp3s onto my phone and use them as ringtones?
you can go to Ventones.com
they have other easy option to get your ringtones
just go there and follow the instructions for your phone and
carrier..
i use Ventones.com
and i really like that site..its super easy to use
and always works
Using Mini Tones to Make Ringtones (I mean micro SD card)