Iphone6 SMS received voice, and then why not?

First, open the settings on the phone's home screen.

Select Notifications to set notifications for general applications or built-in applications here.

Then look for information.

After entering the information, pull it to the bottom of the page and you can see the repeated reminder.

After entering the repeated reminder, if you only want to remind the information once, select Never.

Of course, if you want to repeat the information several times in case you miss important information, you can choose another time.

If it is not the setting reason, it may be the hardware problem of the mobile phone or the other party's withdrawal of voice and other information.