Creating unique features for a real OsmocomBB phone

[Andreas Eversberg]

suraev at stud.ntnu.no 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.
>   
hi,

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.