What's the difference between a bank card with a monthly subscription and a mobile phone number?

The bank card is bound to the mobile phone number, and there is a difference between the monthly subscription and the annual subscription:

1, SMS notification monthly, monthly in 2 yuan, one year in 24 yuan.

2, SMS notification, the package year is one year in 20 yuan and one year in 4 yuan.

Short message banking refers to the electronic banking business in which customers edit the short message service number in a specific format to the bank, and the bank handles related business for customers according to its instructions, and informs customers of the transaction results in the form of short messages.