Head there and ask the same questions in either the Verizon phones or Samsung subforums. There sometimes are restrictions on how large the MP3 files can be if used as ringtones. Sorry I can't offer much more than that but I generally avoid Verizon with their locked down handsets.
I just got this phone yesterday and have learned a lot so far. I've been on the phone with Verizon for a couple hours and no one seems to know how to get ringtones to this phone.
From what I'm understanding, I need to find a 3rd party vendor that I can download mp3 ringtones to my desktop and then sync with the phone. Does anyone have any ideas? I just want the current hit music ringtones on my phone so I can differentiate callers.