"Hello, hello!" A woman's voice came over the phone.

The old lady listened carefully.

"Hello, are you an advertising company?" Hong Feng asked.

"I'm not. You made a mistake. I'm a private phone." The other responded.

"But the phone that my friend gave me was from an advertising company. Did someone else use it?" Hong Feng said.

"I've been using this phone for more than ten years." The other side said.

"Oh, I'm sorry, that's my wrong number." Hong Feng said and hung up the phone.

"That's the voice, that's right, that's her!" As soon as Hong Feng hung up, the old lady said eagerly.

"She's been using this phone...