Getting ringtones on a Katana phone with Cricket Service?

I got a Sanyo Katana phone from a relative that no longer wanted service with Qwest. I also wanted nothing to do with their plans, so I decided to get Cricket service on it. I have unlimited everything, and thats great. The problem is, I cant get internet service on it since, of course, its not a Cricket phone. I apologize if Im posting something already discussed, but Id like to know what I can do to get ringtones and wallpaper [maybe games?] into my phone???
Something to do with a USB cable or something or another? Or am I just doomed to listen to 'Asian Jingle' for the rest of my phones existance???? Please, save me from that!

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Go to phonezoo.com on your computer. Create a account and there you go! free Ringtones! I had a Katana II and a Katana and the ringtones worked for borh