You can use it as long as you enter it.

If you encounter the problem that Apple Mobile Bookstore can't be used, it's because Apple Bookstore has been closed in China, which makes the bookstore unusable. You just need to follow the following steps to solve it: first, open the Apple Book Store and click the registered Apple ID account to enter. Then open the account settings and click the country and region options to enter. At this point, we can see the changes of countries and regions, and directly click the change button to modify. Modify China to other countries and regions, such as Japan, and click to agree to the terms of service. Then fill in the name, address, payment information and telephone information of Japan. After you finish, open the apple book and it will return to normal! You can also use the Apple Book Store normally.