> In that case, usually your hand-held phone will not allow any interaction 
> (at least not mobile phone stuff) while connected to the car.

OK, well I can definitely dial numbers using the phone handset itself, send 
receive texts etc, but the any call details appear on the car display and 
the sound comes through the car speakers automatically even if I dial from 
the phone handset.

> If you can switch between hand-held and carkit speakers, it's not SAP but 
> classic Handsfree Profile (HFP), in which case your phone is still doing 
> the hard work and burning battery power.

Maybe there is a way to switch between the two, I haven't found it yet 
though apart from turning off bluetooth on my phone.

Also what's cool is that if you shoot a video from the phone it mutes the 
music in the car :-)

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