sanyo scp-3100 as a modem?

I was wondering can anybody tell me how can I make my sanyo scp-3100 phone work as a modem? Is that even possible? and how do I make ringtones on my computer for I can send it to my phone?

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sending ringtones to your phone is hard when you dont have a phone that takes a micro sd card.

but making the phone as a modem usually needs a modem plan from sprint. (39.99)