Why does Apple's mobile phone repeat the prompt when sending text messages?

IPhone has the function of setting repeated SMS reminders. Generally, when we are at home, we don't take our mobile phones anywhere, so once someone sends us a text message, under normal circumstances, we won't know. If we miss the news of some important people, the consequences will be very serious, so ... If you don't want to remind us repeatedly, you can set it.

1) Click in the "Settings" of the mobile phone, and then click to enter the "Notification Center".

2) In the Notification Center, we can see the option of "Information", click in, and then click "Repeat Reminder".

3) In the repeated reminder, we can choose the time period or simply turn off the beginning.