问题详情

What is the text mainly about？
A．The bad service in the U. S. cell-phone industry.
B．The crisis in the U. S. cell-phone industry.
C．The conflicts among cell-phone companies in the U. S.
D．The price of the U. S. cell-phone industry.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！