OK, I have seen numerous problems with this and was wondering if anyone out there can clarify and offer any assistance.
I have Jailbroken my new 3G with Winpwn, so it is unlocked.
I have a 2second sound clip I would like to use as a SMS ringtone. I have converted it from everything from mp3 to aiff to aac and even m4r, and then renamed it sms-received4.caf and put it in my phonedmg folder @ C

phonedmg
I then pull up the cmd prompt and pull up iphoneinterface. One thing it does say is that my Iphone state is Factory Activated, is that a problem?
Than i proceed to cd System/Library/Audio/UISounds/ and then once that is done I putfile sms-received4.caf
Once that is done I have tried power off then on my phone and syncing it and such but to no avail. Everytime I go to play Horn it's just silent. Anyone have any suggestions, or something I could have done wrong?