Yes. You can cancel this service. The 30 yuan is actually the annual SMS reminder fee, which is used to remind you of changes in your credit card balance. Download and log in to the ICBC mobile app, enter "Messenger" in the search box, click "ICBC Messenger", enter the "ICBC Messenger" interface, select "My ICBC Messenger" and click "ICBC Messenger" at the bottom Debit Card", enter the "Balance Change Reminder" interface, and click the "Termination" button.