Best Answer - Chosen by Voters
The advantage of the cell phone over the land line is that it can be used outdoor. While using the land line, it is just impossible for you to walk and talk. Usage of cellphone is more visible outdoor, because of this facility. Many find it convenient to talk while going outdoor. I do not think there is any psychological reason in most of the people walking while talking in cell phone. While indoor, people do talk in cell phones, as they remain seated or lying also. That reminds me of the risk involved in talking in the Cell phone, while walking in the road. Many young persons have lost their precious lives. Hence, talking while walking should be discouraged.