In the 400th episode of Detective Conan, Lan is doubtful. Is it mainly about Bian?

In "TV398-399 The Miraculous Family's Commission", Conan accidentally left his cell phone in the house, and Xiaolan sent a text message to Shinichi but found that Conan's cell phone rang, which made her have thoughts. Suspicious, Conan quickly appeared and took the phone away. Xiaolan suspected that Conan's various ideas for solving the case were secretly obtained by contacting Shinichi, so she kept monitoring him during the process of solving the case, but did not find that he had contacted anyone, so she came up with the idea that Conan was Shinichi. At the end of this episode, Conan deliberately pretended to accidentally drop his phone in the car for Xiaolan to pick it up. In the following episode "400 Ran's Doubts", in order to verify whether Conan is Shinichi, Ran decided to open her phone to see if there were any text messages she had sent to Shinichi. After carefully recalling the conversation with Shinichi, I cracked the password of the mobile phone (4869, which is Sherlock), and found that there were no text messages sent by myself, so I decided to send a few more text messages to verify whether they were sent to this mobile phone. The result was After a few messages, he found that his phone was not responding, but the real Shinichi called to scold him. It turns out that Dr. A Li's mobile phone is exactly the same as Conan's mobile phone. Conan deliberately left the switched mobile phone with Xiaolan, and called Xiaolan using a tape with Shinichi's voice that he had already recorded. At the same time, Conan appeared in Xiaolan's room. In front of him, Xiaolan's doubts were relieved. In this episode, Shinichi gives his cell phone number to Xiaolan.