Read the following conversation and answer the question.

M: My mobile keeps going wrong. I'd like to buy a new one.

W: Don't you see the price keeps going down these days? I insist that we wait some time so that we can save more money.

M: You have a point there, but it is inconvenient for me with this broken mobile. Sometimes it powers off by itself. It really makes me very angry when I am talking with someone.

W: In that case,you'd better buy a new one.

M: Well, I'll buy one this evening after supper.

W: All right.

M: Let's go to the shop together so that you can give me some advice.

Question: What's wrong with the man's mobile phone? 

- It cannot be repaired.

- It powers off by itself.

- It's too old.


It powers off by itself.