The sound of text messages on my mobile phone iphone4 is gone. How can I get it back? Help! Thank you.

Settings-Voice-SMS ringtone, you can choose a setting in the system.

IPhone can't send text messages:

Method 1:

Open the settings of the mobile phone.

Find the information.

Turn on the switch for sending and receiving short messages again.

Method 2:

Enter a restore point to restore network settings.

Open the settings of the mobile phone.

Click General and select Restore Network Settings.

Method 3:

Enter the network and open data roaming.

Method 4:

Open the dialing interface of mobile phone and enter * 5005 * 7672 *+8613800abc500 #

. . Abc is the local area code (for example, Shenzhen is 755). . Press the dial key,+is long press the 0 key.