I hope you understand English as I can't write Deutsch, but I can read and understand it.
First of all, BMW used 2 mounting places for (at least) the cabrio model
The S/E Gerät (module). Older systems have the module located behing the rear seats (right side).
The later systems had it located in the trunk.
From what I recall, the later model telefon has a kartenleser vorn, but the old system, you have to put the SIM car in the module.
So yes, it's not good if you want to put in and take out the SIM card many times.
But since you say your car is from 1998, you should have the later model "D-Netz" telefon with a working kartenleser vorn (in the ejectbox).
That last model excepts SIM cards in both kartenleser (ejectbox + module).
"und manchmal sieht man nur schwarze Balken auf dem Display"
Do you mean this?
This can be caused by a bad module (I had this problem) or a SIM card that isn't put in correctly. Try flipping the SIM card and put it in the other way.
Bearbeitet von: M_Parallel am 02.06.2010 um 00:56:48