Detective Conan sends a message to Xiaolan.

In "TV398-399", Conan accidentally left her mobile phone at home, but Xiaolan sent a text message to Xin and found that Conan's mobile phone just rang, which made her suspicious. Conan quickly appeared and took it away. Xiaolan suspected that Conan's various ideas of solving crimes were secretly connected with Shinichi, so she kept staring at him in the process of solving crimes, but she didn't find him connected with anyone, so she came up with the idea that Conan was Shinichi. At the end of this episode, Conan deliberately pretended that he accidentally dropped his mobile phone in the car when he got off the bus and asked Xiaolan to pick it up. In the next episode of 400 Xiaolan's Doubts, Xiaolan decided to turn on his mobile phone to see if there were any short messages sent to Xinyi in order to verify whether Conan was Shinichi. After carefully recalling the conversation with Xinyi, I cracked the password of my mobile phone (4869, Sherlock) and found that I didn't send any short messages myself, so I decided to send a few more short messages to verify whether it was sent to this mobile phone. As a result, I sent a few messages and found that my mobile phone didn't respond, but I called to blame him. It turns out that Agasa Hiroshi's mobile phone is exactly the same as Conan's. Conan deliberately left the changed mobile phone to Xiaolan. He called Xiaolan with a new recorded voice tape. At the same time, Conan appeared in front of Xiaolan, which relieved Xiaolan's doubts. In this episode, Shinichi tells Xiaolan his mobile phone number.