Someone else mentioned this type of thing earlier and I wanted to comment. Very cool thinking and it appeals to me a lot. Is anyone actually trying to put this into action?
Insofar I am aware, mobile payments in those areas is developing (e.g., payment by SMS).
In my opinion, we need some more years for the back lands to sufficiently upgrade on mobile networking (internet) and devices (smartphones) before we may expect BTC to lift off in those areas of the world. This element of time can hardly be considered as a blockade for BTC, because the more spread out the use of BTC is at that time, the better it will gain traction in less developed areas of the world.
In terms of mobile payments, we could use progress on speedy payment confirmation and a mobile BTC client that is lightweight and data-thin. I am yet to make/receive my first mobile Android BTC payment....
