On my BlackBerry, pressing the Menu key during a BT call gives me the option of "Switch to Handset".
You don't have to turn OFF the BT on most handsets - most give you a way to do this as above. Varies by handset.
HOWEVER, in my 2007, doing that doesn't break the BT connection, and the iDrive stays powered up until I end my call - even if I lock my doors! So be aware...
|