This is usually because the mobile company has set up a reading app under your phone number, which will access the internet to download and read novels, thus deducting your monthly rental fee. In addition, some reading applications will make money through advertising and other revenue, which may also cause you to deduct your monthly fee. If you want to avoid this situation, please check the mobile company policies in your area to see if there are any restrictions or guidelines that can restrict the use of reading applications. You can try using a free novel reading app or use a Virtual Private Network to bypass the limitations of mobile applications.