[mkd1964]

Phones have GPS. In states where texting and driving is banned, why isn't there some way to program the phone so that it simply doesn't function if it detects a speed of over 5-10 mph?

I just don't see a problem with that since it's already the law.

It could then send an automated message back to the caller letting them know the owner appears to be driving and can't take your call.

I'm sure many of us here are old enough to remember life before cell phones and I can guarantee you that there's almost never anything so emergent that it can't wait until you get to your destination.