The issue seems to be not talking on the phone per se but concentrating on a second task, such as making a decision with the person on the other end of the line.

• 这个结果显然不是为了安全考虑不要用手机打电话，而是注意力在一秒钟的集中，就好像和另一个在电话线那端的人作一个决定。