Why is the bank card short message service so expensive?

0 1 SMS service fee of Postal Savings Bank 30 yuan refers to the SMS service of bank cards handled by Postal Savings Bank, and 30 yuan is a one-year fee. Short message service is a short message prompt sent by the bank to consumers when the funds in their bank accounts change. Postal Savings Bank generally charges 3 yuan for short messages for one month, so it should be 36 yuan for one year, but 30 yuan for short messages for one year, which is more cost-effective because of the appropriate discount. 30 yuan refers to the short message service of bank cards handled by the Postal Savings Bank, which costs one year. Short message service is a short message prompt sent by the bank to consumers when the funds in their bank accounts change. After the user opens the SMS service of bank card, the user will be informed of the change of bank card quota in time. This function can inform the cardholder in time after the bank card is stolen and swiped, so as to avoid greater losses. If you don't need bank SMS service, you can call the customer service phone of Postal Savings Bank to cancel SMS service.