There is no SMS record in the SMS query of Unicom's online business hall, but the mobile phone display has been sent. Did the other party receive it or not?

According to your description, if you send more than 100 messages, some messages may not be sent. Generally speaking, the number of short messages sent by Unicom number should not exceed 100 per day and 1000 per month. Different cities have different commercial policies in this respect, and local policies shall prevail. If the number of short messages exceeds the limit on that day, it may be unsuccessful to send them, which is a situation. In another case, some of the numbers you sent are empty or out of service, and there is no record in the short message list of Unicom's online business hall that the other party can't receive.