Interface to Cellular Processors?

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I am looking into interfaces for cellular processors (Used in smart phone,
PDA's etc) to do data transfers of about 50-100 Kbps. In specific I have
considered Serial, SPI, I2C to do the tasks.

Can anyone with relavent expriece/knowledge shed lite on why one of these
is a prefered interface vrs others (or any that is not mentioned)?

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