How difficult would it be for car makers to hook up a cell phone jammer that would be activated when the vehicle is put into gear?

If a call come into that number when car is in gear the phone will not ring but take a message only.

When will common sense prevail and save some lives on the highway?

07 Speedmstr, Long Tors, bags, sissy bar and rack, windshield, engine bars, 2 ww lights, 2 fast eddy stickers and a .45 ACP.