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Well, this is cool, but it would be cooler if they wrote an open source cell tower for GSM phones running on Raspberry Pi.

I have this sitting on my desk at the moment (just OpenBTS + rPi + a SDR). Nothing too crazy about it.

I like this because they are using the rPi itself as a radio -- that's a pretty neat hack.

$5k for a dev box? Not really in the same league...