When users send a large number of short messages, why do some users receive them and some users don't?

Reason for not receiving: 1. Sometimes it is caused by normal channel congestion, because when sending a group, the information is sent to the gateway channel in the form of data packets. But sometimes the gateway will lose packets at the peak. 2. This problem also occurs when the user's mobile phone is not in the service area or the number is wrong. Thank you for your interest in telecom products. I wish you a happy life. If the above information can't solve your problem, you can also log in to Guangdong Telecom Mobile Mall () to seek help from online customer service, which is available 7X24 hours a day!