Creating unique features for a real OsmocomBB phone

Andreas Eversberg andreas at
Wed Jan 25 13:34:35 UTC 2012

suraev at wrote:
> Sorry to disappoint but that would require hardware modifications similar to those
> made for traffic interception by Karsten et all. Normally phone do not see uplink
> radio from other phone because of antennae filters.

why should two phones use uplink frequency to communicate directly
together? why not using downlink frequency? iirc, a phone can transmit
on downlink, since there are no filters on tx side.

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