The Agricultural Bank of China texted me that there was a penny in my card, but what was the reason why I didn't deposit it?

There are several possibilities: \xd\1. Your card has not been used for a long time, and it belongs to the "tail zero account" and "sleeping account" managed by the bank. From the point of view of bank management, it takes up resources and is invalid, so it needs to be activated to avoid being classified as dead or dead by the system. The management will also assign the business indicators of clearing "tail zero households", "sleeping households" and minimum business volume to outlets. Sometimes, for customers who have no transactions for a long time, but have potential value, the network staff simply help you save a penny, activate the transaction records, increase the business volume and retain the old customers. \xd\2. You have opened the bank SMS notification function, and the bank helps you experience the effectiveness of the function. \xd\3. Error in the accounting processing system of the banking system. The probability of this happening is extremely low. \xd\4. Others tried to deposit a penny into your account through online banking, etc., with unknown motives. \xd\5. Other accidental phenomena.