1. First enter Douyin and click on Settings.

2. Find "Feedback and Help" and click it.

3. Then click on "Account Login/Bind/Block/Modify Nickname and Avatar".

4. Then click on "How to Change/Unbind Account".

5. Finally, click on "Other Binding-related Issues" and give feedback to the customer service to change the mobile phone number.

Extended information:

Douyin (Douyin, recording a beautiful life) is a music creative short video social software, incubated by Toutiao, and is a 15-second music short video community focusing on young people. It has videos of various types of preferences and was launched in September 2016. Users can use this software to select songs, shoot music short videos, and form their own works. It will update users' favorite videos according to their hobbies. This app has been launched in all major Android app stores and APP Stores.

On November 10, 2017, Toutiao purchased the North American music short video social platform Musica.ly for $1 billion and merged it with Douyin.

On April 10, 2018, Douyin, a short video platform under Toutiao, announced that Douyin officially launched an anti-addiction system.

On April 11, Douyin announced that it would conduct a comprehensive system upgrade from now on, during which the live broadcast and comment functions would be temporarily suspended, and would be reopened after the upgrade; WeChat and QQ also suspended the direct playback function of Douyin APP external links.

In June 2018, the first batch of 25 central enterprises collectively settled in Douyin.

In May 2019, Douyin once again upgraded the "Sunflower Plan", which mainly included two aspects: in terms of products, the parent-child platform function was launched to assist parents in managing the healthy use of their underage children's Douyin accounts.