Easiest way to put caf files onto 3gs 4.0

[sledneck800r]

I'm sure this is just a noobie question but what is the easiest way to put your own mp3 or caf file onto your iphone for an sms alert?
I'v heard SSH to your phone, but i'm not quite sure if that's the right way for me.
Thanks a bunch,
Chris

[g0sbv]

if you dont want to ssh then look into buying tonefxs from cydia
R.

[Simtech]

iphonebrowser