Is the "SMS" service of bank debit card useful? How much is it usually a month? Isn't it safe not to use this service? Detailed introduction, thank you.

SMS is to inform you of the changes in your account, so as to keep abreast of the account information. Banks provide such services to ensure the safety of customers' funds.

The charge is generally around 3 yuan/month.

Personally, I feel that the effect is not great. The most important thing is that you pay attention to your own safety and don't reveal your password.