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A comment on $15 phone, 3 minutes all that's needed to eavesdrop on GSM call. Parent comment

Re:$15 phone, 3 minutes all that's needed to eavesdrop on GS... by cnvogel on Wednesday December 29, 2010 @01:14PM (#2049605)
Actually, four cheap phones (4x Motorola C123) have been used, operating in parallel. :-)

And they have furthermore been modified to remove filters that in "normal" phones improve signal reception but for this particular application would prohibit you from listening to the base-station-to-phone direction.

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Re:$15 phone, 3 minutes all that's needed to eavesdrop on GS... by 246tNt on Friday December 31, 2010 @03:27PM (#2056356)
Yes, 4 ... but the number is not really important, mostly depends on the activity of the cell. Also my code is currently highly sub obptimal (I use 1 entire phone to listent to 1 control channel ... in theory a single phone could dump 32 of them at once).

And only one single of those was modified (the one used to dump the traffic/voice channel, the other only listen to the BTS)

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