When the phone is turned on, you can't receive the short message of turning it off.

Network problems. It must be caused by the inconsistency between the home location register and the visiting location register. However, this problem will not occur again after recovery. According to your description, the problem is repetitive and strange. Unless the following conditions are met:

1。 Your area happens to be the handover area of two mobile switching centers, and cross-office handover often happens, but there is a problem in the coordination between these two offices and your home location register, so you can't complete the whole process of cross-office handover. Every time you switch, your number can be registered in the new visitor location register, but you can't update the user location of your home location register. At this time, the home location register records your location before the last switch. However, the probability of such failure is very small. If you are called many times, you should act as if it is sometimes connected and sometimes it is not.

2. Your card is copied, and the copied card is used continuously. As a result, only short-term barrier-free communication can be carried out between two card copying. Once your partner calls or sends a text message, the user location information in your home location register will be occupied by the copy card. At this point, you still can't make any voice or SMS calls. Although the probability of this situation is very small, we should pay attention to it. Because this kind of duplicate card will bring you huge economic losses, the cost of sending text messages in groups will reach several hundred thousand yuan a day. Before finding the duplicate card, the operator can't stop the duplicate card normally. You'd better check the telephone bill.