Joke Collection Website - Public benefit messages - Why is there a school newsletter in the background, but parents can't receive text messages?

Why is there a school newsletter in the background, but parents can't receive text messages?

Caused by system instability. . .

At present, a considerable number of short message systems, whether sending cards or gateway channels, can not guarantee 100%. In fact, even if you move, you can't guarantee 100%, and it's normal for some of them not to be received. . . If you want to be reliable, you still need to find a professional 106 to send member messages.