1, the phone receives SMS network instability, data packet loss.

2, there is a software layer in the background of the system to block the SMS, resulting in incomplete reception.

SMS:

Short message service (SMS), part of the "converged communications" business plan, is a text or digital message sent or received directly by users through their cell phones or other telecommunications terminals. The number of characters that a user can receive and send each time is 160 English and numeric characters or 70 Chinese characters. SMS is a telecommunication service that accompanies the digital mobile communication system. It is a non-real-time, non-voice data communication service that transmits text or digital short messages through the signaling channel and signaling network of the mobile communication system.

Packet Loss:

Data is transmitted over the Internet in packets, nK per packet, no more and no less. The transmission of data packets, not 100% can be completed, because of worms, network cable connection distance is too long, network cable failure, the operating system itself fault, network card failure and other reasons, there will always be a certain loss. In this case, the Internet will automatically allow both computers to make up packets according to the agreement. If the line is poor (such as with a cat), the amount of data loss will be very large, and the work of replenishing packets can not be 100% complete. In this case, there will be voids in the transmission of data, resulting in packet loss.