You may lost text sound notifications with incoming texts alerting you with a sound whenever you receive a text. This article explains what to do when your idevice is not making any sounds when you get a new message.
Devices: All iPhone models (e.g., iPhone 6, iPhone 5, iPhone 6s ), all iPad models (e.g., iPad Air, iPad 2)
How to fix sound notification problems
If iPad or iPhone notification sounds are not working, meaning if your iPhone (or iPad) does not let you know when you receive an incoming text message (e.g., iMessage), here is how to fix:
1-Make sure that you do not have Do Not Disturb turned on. You may check this by going to Settings > Do Not Disturb. Set this to “Off”.
2-Make sure that Do Not Disturb is not turned on for any particular contacts. To check this, launch the Messages app where you can see your messages. Does any message have any moon sign? If there is, this means that you enabled Do Not Disturb for that contact:
Do disable this, tab “Details” and turn off “Do Not Disturb”
3-Tap Settings > Notifications > Messages, make sure that “Allow Notifications” is turned on.
4-Your device has a mute switch (ring or silent). On your iPhone, this switch is located on the left side of your device, on your iPad, it is located on the right side of your iPad:
Make sure that the mute button isn’t turned on by pushing the “Ring/Silent” switch to the “Ring” position.
5-Restart your device by pressing and holding the sleep/wake button until you see the slider then slide the slider.
6-Reset your device by holding down the home button and the power button (wake/sleep) until you see the Apple logo.
7-Restart the Messages app. You can force the Messages app to close. Simply press the home button twice, find the Messages app and swipe up to close it. Then relaunch again.
If you do not see the contact names, see this article.