Thanks for that info and choosing the Apple Support Communities. Based on what you stated, it seems you are having issues with sound being lower in one ear when listening with headphones with your iPhone. To help with this issue, please follow these steps:
If you can't hear any sound or if only one side of your headphones works
- Adjust the volume with the volume buttons on your iOS device or use the Volume slider in Control Center.
- To see if you need a replacement, try a second pair of headphones. If the second pair works, contact the manufacturer of the initial pair and ask if you need a replacement. If the second pair doesn't work, contact Apple Support.