No Sound on iPhone after Updating to iOS8 or iOS9
With any new updates from Apple for the iPhone or iPad there are sure to be some initial bugs or issues that will arise. Usually the first release of an iOS is in some ways a beta for the public so Apple can seek out any problems they missed. From there Apple is able to resolve most of these issues with new updates. The new iOS8 update and the upcoming iOS9 update will effect different models of iPhones in different ways. With the latest iOS8 update the iPhone 4 and iPhone 4S had major sound and volume issues with no explanation from Apple. This problem can go though to all iPhone model from the 4 to the 5 / 5S / 6 and the 6 Plus.
No Sound iOS8 Step 1
One of the first and most important fixes for this speaker and sound problem is to check for any recent updates from Apple. This should fix any temporary glitches or bugs that may be in the software. This can be done by going into Setting > General > Software Update > Download and Install. As with checking for updates for the software it is also highly recommend to check for any new App updates. There have been several reports of some Apps that once opened on the new iOS8 to cause sound issue. App updates can be done by App Store > Updates > Available Updates > Update.
No Sound iOS8 Step 2
Whenever people ask me to fix there iPhone whether it be a sound, camera or screen issue I always recommend doing a hard restart. Just with a PC or Mac when you run into problems the first troubleshooting option is to restart. On a iPhone it is very easily done by holding down the sleep/ power button and home button together for 10 seconds till the iPhone turn off. After the iPhone has turned off it should boot back up with the Apple logo.
No Sound iOS8 Step 3
As with step 1 with some Apps causing the sound issues it is recommended uninstalling 1 App at a time until the sound / volume comes back. If certain Apps haven’t been updated for iOS8 or iOS9 platform it can cause compatibility issues which may also cause crashing of the iPhone. Uninstalling Apps can be done by pressing and holding on a App till it jiggles then press the X on the App. All Apps be be reinstalled later on by going into the App store download history.
No Sound iOS8 Step 4
If you iPhone was connected to any Bluetooth devices during the update this can cause some issues after the update with the iPhone thinking its still connected and won’t play sound through the speakers. There is a simple fix by turning your iPhones Bluetooth off or turn it on and off. This can be done by going into Settings > Bluetooth > Off.
If you are stilling running into walls with the sound / speaker problems there is a full article here with more methods and fixes. Also if you have tried any of these and have been successful please share your experience below as it all helps :D.