【答案解析】[听力原文]
M: I"d like to return this cell phone I bought the week before last. It doesn"t function properly.
W: All right. I"ll be happy to assist you. May I know what problems you"re having?
M: I started having problems last week. When I tried calling out, I kept getting dropped. Now, I can"t reach anyone at all on this phone.
W: Sir, I think I know the problem. You may not be located in a place with a strong wireless connection. Next time you make a call, make sure you see five bars on the screen, which means you"ve got a full connection. It"s all explained in the manual that came with your phone.