There is no sound in Iphone4 SMS.

There is no sound when the iphone receives the text message. It may be because the SMS of iPhone is set to no beep or the notification option is turned off. You can set the iphone SMS reminder by entering the settings, as shown below:

1, find the settings first.

2. Click the notification.

3. Click to enter the SMS settings as shown in the figure.

4. Set as shown in the figure.

5. Sliding down should also be set in the options.

6. After the change is completed, you can see the reminder message and sound reminder on the top of the phone.