What if the mobile phone card is locked by the system after sending a message and cannot receive short messages?

Your card will be locked because the probability of sending messages in groups is too high. If you are prompted to enter the PUK or PIN code, don't lose it, or you will automatically lock the SIM card if you lose too much. Then you have to make up the card. You can go directly to the business hall and ask the salesperson to help you check. Just unlock it, and there is generally no charge. In addition, I suggest you use your mobile phone to log in to WAP handheld business hall, where you have your personal information, as well as PUK and PIN codes. You can write it down later.