I have this idea: how could we start a bitcoin-over-GSM phonecall service? It should be possible to send bitcoins over a phonecall as a modulated audio stream. The only problem would be the storage, which has to be as a recording or binary data (transforme by some software in the smartphone)
GSM networks only support well certain sound frequencies, but I'm sure it would be easy to encrypt digital 0s and 1s when using the correct frequency.
This should not be very difficult actually.
And BTW, this is an awesome idea.
Even if they censor the internet (which is unlikely), we will still transfer bitcoins over phone.