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I wonder how easy it would be to improvise a "software" modem using the mike and headphones. Should give around 1k, plus compression... much better then nothing.

If there's any way to directly connect phones (mobile or landlines) to a computer without any wiring it would be even better. Come to think of it, could't one make an android or iphone app for this?

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IF government will shutdown even Internet, will it keep land-line phones online?

You can start from linmodem project: http://bellard.org/linmodem.html , it may allow to create 9600 connection on 1GHz processor.

Of course, phones have built-in DSP processor, but each phone model has it own DSP. Some OpenGL chips are able to do FFT using vDSP (e.g. iPhone4), so it can be used to accelerate soft modem.

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