[Carz]

I think voice transmission is best via bluetooth headset (no lag, echo issues). As for the mode of connection between the PC and phone, cable would charge the phone battery at the same time while offering a much more stable if not faster connection compared to wifi and bluetooth which also drains the phone battery and will require frequent charging anyway.

Sometimes, the simpliest solution works better rather than re-inventing the wheels.

Remote control software such as MyMobiler offers just that although limited to PPC/smartphones only. No hassle of transfering of contacts/sms needed.

Embedding into CF and enlarging the display by editing the MyMobiler.ini is not a problem but the default skin only works in portrait orientation leaving a whole lot of screen unused and thus the interface is too small to be eyes and fingers friendly for a 7" touch screen car pc. It just need a skin (perhaps landscape) with large buttons/interface for car pc usage. For those phones that does not support landscape, the skin could have the menu buttons on the sides rather than below the PPC screen.

Wonder if there's any other remote control software that will work better as an embedded appz in CF.