Hi, I bought at ebay the similar TCU modul ( I have already another one, working great, but thought that this one will support Cyrillic). I also stripped mine, because it didn't pair via Bluetooth as I connected it (it was a message "INISERT CARD" when I pressed RT button) and I was interesting what is the slot on the side.

You're right, the slot on the side is for the Molex SIM card holder.


So you have to buy it (Pt Nr: MOLEX - 912360001 )

So finally I find out that this TCU using two sim cards, one in the Assist module (I suppose that your O2 card inserted there ) and personal card that have to be inserted in the slot on tha side.

I inserted the SIM card into this slot and found that TCU recognise it - It can read phonebook from it, can dial numbers and I also able to call it from another phone, but the problem is that I can't answer incoming calls, and when I put outgoing calls and the other side answering it doesn't hear me

The message "INSERT CARD" still appeared on the radio screen, so I also removed allu plate inside TCU and insert my SIM card there, but didn't try yet... Hope will do it next weekend.

PS: SIM card need to be unlocked from PIN (configure this on mobile phone)
PPS: car X3'2004, working TCU - 06'2005 (voice control, bluetoth etc - OK)
nonworking TCU - Continental Everest Ibus ECE (07.2008)