BMW 5 Series: Mobile communication devices in the 
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It is advised that you do not use mobile communication Mobile communication devices in the vehicle
It is advised that you do not use mobile communication devices, e.g., mobile phones, inside the vehicle without connecting them directly to the external antenna. Otherwise, the vehicle electronics and mobile communication devices can interfere with each other. In addition, there is no assurance that the radiation generated during transmission will be discharged from the vehicle interior.◀

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