so do u have option code sa640 but not sa639? whats the last 7 digits of ur vin? is it a US car? Do you have telephone buttons on the steering wheel? it will be expensive to retrofit bluetooth after the fact. You will need to replace the TCU (telephone module) with a TCU which has BMW assist with integrated bluetooth. You will prob also need a Bt antenna. depending on your vehicle options you may need more components. Also you will definitely need retrofit coding.

I dont know if you can order a European ULF module for e70. I know you can for e90. this may be an option too.

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DT