No incoming message sound when locked - iPhone 6, iOS 8

TRY THIS ITS WORKED IN MY PHONE.......FIRST OPEN ANY SMS ON THE TOP RIGHT SIDEYOU SAW A ICON TAP IT A NEW WINDOW OPEN SCROL UP YOU SAW ”HIDE ALRETS” IF ITS TURN ON (green) TURN IT OFF I HOPE YOUR PEOB SOLVE........I SEND SOME DEMO PICS........THANKS

The only thing that worked for me was the following.

settings--notifications--messages--alert style when locked<<changed it from banner to alerts

I Can hear my texts now.

Cheers!

The YouTube-turn-up-the-volume-thing is what finally worked for me, thank you for the tip! I had tried everything except restarting as a new phone. I've had my phone for almost 2 years and it's the first time i've noticed it starting to do this--very frustrating to miss texts from friends/family and clients! I just hope it doesn't decide to do it again!

Well, after I thought I had it fixed, it is alas NOT! The video volume thing only worked once and then it went back to not working. Tried rebooting, tried everything but resetting the phone; which I really don't want to do s it is such a pain. It does seem as though it started happening after the last update, grrrrr.

Could it be that your connected to a Bluetooth or other wireless device that is getting the sound signal? Just a thought. It happened to me when I was near my vehicle which was still running and was connected via Bluetooth.

Good luck!

RESOLVED - I have been having this issue too for several years now. For no specific reasons, I would regularly observe that there was no more text message sound notification (silent switch and Do not Disturb functions were not activated). I would clear the bug by simply rebooting my phone (switch OFF-ON). Today, I tried again to determine the cause of this erractic behavior and I manage to replicate the bug. I can confirm that it is related to the bluetooth. I have a Denon sound system that I have equipped with a Bose bluetooth adapter (optical connection). Earlier this week, I connected to my sound system to listen to Sirius music from an App on my iphone 6. Since then, there was no more text message sound notification. Even if my sound system is turned off and the Sirius App is closed, the phone remained connected to the Bose Bluetooth adaptor. I switched OFF-ON the iphone bluetooth and voila! The Bose bluetooth adaptor was longer connected to the phone and the sound notification of text message went back to normal. I tested one more time to confirm and validated that the same bug occured (no sound), disconnected the bose adaptor from my iphone bluetooth and the notification sound was back.

I think this may have solved my problem - I was connected to a bluetooth device which was connected to a Bose radio. Not sure how long that has been on, but after disconnecting it I immediately had sound again. I hope that was it once and for all.

Go to Do Not Disturb in Settings and scroll down and Silence setting will be there and change it to Always

My iPhone 6 has started doing this today and it seemed to start after i used my headphones. I'm getting no tones from any apps, imessage/text/sms whatsapp, mail. Nothing.

Exact same, started working all of a sudden after I received a message while I had headphones in, since then seems to be ok.

Hi, I have been experiencing this same problem, including with incoming voice calls, on my iPhone 6. Has Apple suggested a fix for this? Using the headphones doesn't appear to do the trick. Thanks.

I've had this issue on my 4s and 5s only when I've configured certain email accounts as IMAP. Changing to POP3 alleviated the issue for me. Not sure if it's the same thing here, but I thought I'd mention it.