copied this to its own thread since it's informative - thanks!

Originally Posted by Logan1987

I got the ringtones on my phone and working, but how do i set certain ringtones for certain people that part isnt working for me

Select "contacts".
Highlight contact you wish to assign ringer to.
Press menu/ok button.
Select "options".
Highlight "edit contact" and press menu/ok button.
Scroll down and highlight "ring".
Press menu/ok.
Highlight "my videos" and press menu/ok button.
Highlight "memory card" and press menu/ok button.
Highlight the ringer file you wish to use and select "assign".
Select "done".
It now shows the contact details and you need to make sure you assigned the correct file. It should be something like "sspx0011". Get the person to call you to test it out. This is how I did mine. If it doesn't work for you, I'm not sure what else to try. Hope this helps.