Sorry to hear you’re having trouble with your sound. Here are some settings to check:
  1. If you’re having trouble with all sound, including video, access your Control Panel by swiping up from the bottom of your device.
  2. Check that the Mute option is turned off, not highlighted.

If your device has a side switch - iPhones on the left and iPads on the right - you should switch it so that you cannot see a red dot.

You can also change this side switch to Lock Rotation. This will help stop the issue from recurring. Just follow the instructions below.
  1. Go to your device’s Settings
  2. Make sure General is highlighted
  3. Look for Use Side Switch to your right
  4. Tap the Lock Rotation Option