What is the twitter iphone application that can save twits(with text, pix, etc) and send later when i connect to internet?

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I want to send my mp3 files to my iphone and use them as ringtones, how can I do that?
I have a jailbroken iphone, and I curently do not have a sim card so I cannot use sms or mms. I’d prefer a free program or method for windows.
P.S. I do not need to download any music or ringtones, I already have what music I need.

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