i've noticed a few times when entering the car while on the cell phone that it goes silent (for both parties on the conversation) until the car's BT has picked up the signal and has taken over. This is done automatically and takes about 10-15 seconds..

same thing happens in reverse when leaving the vehicle...

it's actually a nice feature....especially if i don't have to hit any buttons to make the transition...

not sure about call waiting...haven't received a second call to notice whether it supports it or doesn't...

but if you guys say it doesnt support it... well can't do much about that..

i'll test it this weekend too!

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2012 X5 50i M-Sport
2014 X3 35i M-Sport