John -- thanks for the comments. We have that ability for win mobile to granulate to sms alone, and are working it into the BB. You certainly keep both hands on the wheel when using your bluetooth, however the distraction level is still high.
Studies show the crash rate among teens drivers doubles or quadruples with two or three passengers, respectively, when compared to driving alone. Talking on the phone is is kind of like having another person in the car.... that was the thinking for the block all.
If you go to the driving preferences menu, you can select block sms only for win mobile phones.
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