Hi everyone,
I have 2002 D2 with phone preparation with external GSM antenna, which is not currently used.
The "box" below antenna mast have 3 connections and all of them are
not used 
1. Funk, GSM 900-1800, connected with signal amplifier and then with GSM module.
2. RC, 433Mhz. Have no idea what it is. Can anyone explain?
3. FM Radio and +12 DC.
It's kind if strange to have OEM Audi antenna on the rear fender with 3 great connections and none of them is actually used
Do you guys use at least one of these connections for anything? For instance, can I get any iPhone car kit which will allow me to use the external GSM antenna (connection number 1)?
Thanks!