Smartphone users including me are using Headphone, Earpiece and Bluetooth headphone for music, Watch Movies and Receive or Make a call any time. Users noticed many problems that cover in this article. First, one is the Sound stop on change Headphone mode or Stuck the screen, Apple Headphone not sounding batter then third-party Bluetooth headphone, Air pods not connecting and Switching during a call, Boost the Sound of Headphone on iPhone 6/6 Plus.
It may be the primary reasons, Are you experiencing this problem after or before iOS update. Note this, take the rollback easily by updating or Downgrading iOS.
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Steps for Fix iPhone 6 Headphone Volume too low and Won’t connect
Reset All Settings
Some settings on the iOS device are too much complex, some settings conflicting internally and Wrong settings can we fix by resetting.
Go to the Settings > General > Reset > Reset All settings. This option will make all iPhone settings to the default option.
Disable/Turn off or Increase Volume Limit
Have you fixed the level of volume for music app? Once you adjust this, you can change it to the set limit only.
Check Volume Limit on iPhone Settings app
Go to the Settings > Music > Volume Limit > Increase the value of the slider. Maximum volume limit auto turns off this feature.
Also, Enable Sound Check toggle option under Music.
Restart or Reboot iPhone 6/6 Plus
Force Restart, Press and Hold sleep/Wake button + Home button until you see the apple logo on the screen. Turn on by press side button only.
Enable Hearing Aids on iPhone 6/6 Plus
Hearing Aid improves audio quality with some hearing aids.
Open Settings app > General > Accessibility > Hearing Aids Compatibility toggle mode on
this setting improves audio quality with some hearing aids.
Also, Enable Mono Audio just above the Phone noise Cancellation option.
Restore for Factory Settings
Your iPhone is freezing and unresponsive during playback some media app or call. Check if any update available under settings > General > Software Update.
Or Facing issues of iPhone 6 Headphone Volume, Downgrade current iOS to previous. Or Reset the device to factory settings.
Connect iPhone to iTunes via lightning cable.
Go to device summary > Restore.
Before restore to latest iOS all content and settings will erase from iPhone 6/6 Plus. After that, we can restore the most recent backup from iCloud or iTunes if we have taken before restoring process.
Other useful Resource: iPhone 6 Stuck in Headphone mode
Are you thinking hardware damage on the Headphone jack, Contact apple support to check deep scan and say to fix it free if under warranty.