Harald Welte and Steve Markgraf presented at 27C3 CCC in Berlin, Germany, on the OsmocomBB project, a Free Software implementation of the GSM protocol stack running on a mobile phone. This provides the security researcher a tool equivalent to an Ethernet card in the TCP/IP protocol world: a simple transceiver that will send arbitrary protocol messages to a GSM network. Slides of the project are available for download.
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very interesting
no evil please
Interestingly, all of these phones are gone or close to being gone from ebay :)