After the mobile version of Xiaomi Mall enters the homepage, there are three options in the top bar: Mall, Classification and Service. Swipe right twice or click the service option directly to enter the service function. After entering, click the sub-option of "Consulting Customer Service" in "After-sales Service". There are two customer service options: "Consulting Online Customer Service" and "Calling Customer Service Staff", which you can choose according to your own needs.
Common Xiaomi questions, enter Xiaomi official website and Xiaomi Forum, and if you are careful, you can generally find the answers to the corresponding questions.