If the "Telephone" option is not displayed on the main navigation menu, then the TCU is either not connected or it has failed. Based on the date of manufacture, that TCU should have the Bluetooth feature, but I am not as familiar with the European TCU modules.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input