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+OsmocomBB: Protocol stack and baesband firmware for GSM mobile phones
+
+By: Harald Welte[1]
+
+The OsmocomBB project[2] is a Free Software implementation of the GSM
+protocol stack running on a mobile phone.
+
+For decades, the cellular industry comprised by cellphone chipset makers and
+network operators keep their hardware and system-level software as well as GSM
+protocol stack implementations closed. As a result, it was never possible
+to send arbitrary data at the lower levels of the GSM protocol stack.
+Existing phones only allow application-level data to be user-supplied, such as
+SMS messages, IP over GPRS or circuit-switched data (CSD).
+
+Using OsmocomBB, the Free Software enethusiast as well as the security
+researcher finally has 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.
+
+By the time Linux Kongress 2010 is held, it is expected that OsmocomBB
+has proceeded to a level where it can make actual phone calls on any
+GSM network.
+
+[1] http://laforge.gnumonks.org/
+[2] http://bb.osmocom.org/
personal git repositories of Harald Welte. Your mileage may vary