Push the right menu key. select contacts. Highlight the contact you want to assign a ring-tone to. If you have the contact on both the phone and the "Simm" card, choose the one that is
not on the Simm. Or if it is only on the simm, add it to contacts and then select it.
Click menu, then edit. Scroll down to "ring tone". select it and it will bring up all the sounds recorded on your phone. choose the one you want and hit OK.
OR you can hit -Start-Programs-Sounds-Menu Button-New Sound-record a sound-call it what you want-the do as above for using it as a ring tone.
I recorded myself playing a mandolin and use it as my "known-caller" ring tone

