1. School-related applications or services: Some universities will use mobile phone applications or services to provide information or management, such as mobile phone campus app and mobile phone educational administration app. If the changed mobile phone number cannot receive the information sent by these applications or services, it will affect the acquisition of important information or the completion of related operations.

2. Campus network accounts: Some university campus network accounts are registered with mobile phone numbers. If you change your mobile phone number, you need to update the account information of the campus network to ensure that you can access the campus network normally.