Why is the SMS number of the bank card service changed without knowing it?

Hello, I think there may be two reasons why your service SMS number was changed unconsciously:

1. You personally went to the bank counter today to handle the number change business in your personal information. It may be because you changed your mobile phone number or a new one, or because you can't receive the verification code when you change your mobile phone, you may change your number at the bank. At this time, some salesmen will help you modify the service SMS number because you changed your number. There should be a business certificate. You should sign it. You don't have to worry about this situation.

2. In addition, the bank self-service inquiry terminal has the function of customer self-service inquiry, modification and deletion of service short messages. If someone holds your bank card and knows your password, they can operate it themselves. For example, a wife may change her husband's SMS number to her own. .