Iphone SMS prompts twice

The solution of Apple's mobile phone's repeated reminder of SMS: It may be caused by turning on the "repeated reminder" function. In Settings-Notification-Information, just turn off the "Repeat Reminder" function at the bottom. After closing, whether you check the new message or not, the new message will only ring once to remind you. If this function is turned on, as long as you don't check this new message, the phone will ring repeatedly to remind you to check the message.