Roll up your window and turn off the A/C while driving...

Also, make sure that the people you are calling have decent service as well.

 

This seems to be my experience as well. I have had complaints from the receiving end while driving. Apparently after I speak there is some noise. I just assumed that it was road noise or poor reception in that particular area. Still could be though.

 

What kind of car do you have and how frequent are the complaints.

I talk with Windows down and music on and they can understand me just fine ;p

Is their service T-Mobile? That would be your answer if so

 

It could be that your car has a lot of road noise and you don't realize it because you are used to it? Could be a certain element in your car?

Dunno sorry

 

Maybe you should turn down the throttle on that lawnmower too.