First of all, when it was still in the free period, I always thought that there would be no charge after the EC2 sample was stopped, but later I was secretly charged more than 10 dollars, which was very surprising. Later I learned that for the Elastic IP I bound to an EC2 instance, EC2 can be left on all the time during the free period, because EC2 + an Elastic IP are free during the free period. The key is that I'm cheap and want to save resources for Amazon. I figured that my example is of no special use anyway, so I turned it off. As a result, there was a problem at every level. The EC2 example is stopped, but the Elastic IP is still bound, that is, the Elastic IP is still bound to an unstarted example. Amazon thinks this is a waste of IP resources, and instead wants to ask me for money. It's really like eating flax and coptis. It's hard to describe the pain. Why can't Amazon automatically unbind the Eclipse IP after stopping the EC2 example? Therefore, remember: After stopping the EC2 example, be sure to manually unbind the Elastic IP. Then use the coupon. The $70 can be used for more than two months. This time is just enough time to make you forget that you are still driving a useless example. When the free credit is used up, the charges will start quietly. I didn't know it yet, but I didn't know until the credit card bill came next month that I had been charged nearly $20 again. Embarrassing... So I quickly stopped the example. In the past, I stopped charging the EC2 instance and stopped charging, and I also learned my lesson and did not bind the Elastic IP. As a result, the bill came for another $15 this month, which was completely messy. After another check, it turned out that EBS storage also required There is a fee. Even if the instance is stopped and it takes up space, there will be a fee. I don’t know when the rules were changed. I’m afraid it was just recently, but I didn’t receive the relevant notification... Okay, in that case, let’s close the account first. (Of course, I’m not sure if it’s really closed. The credit card information is still there with Amazon, and they have been keeping it in a pigtail.) First, enter My Account, in the upper right corner of the page: Then scroll to the bottom, there is a very strange Obvious small print: Cancel Your AWS Account Click to enter the prompt page, click the very obscure button on the right: Then you will be prompted that your account has been stopped. However, it is stopped, and the original expenses incurred will be paid. I haven't found a place where I can delete my credit card information. I've looked around online and can't find anything. Maybe the best way is to cancel the card. ． ．