We are not able to increase or decrease volume without unlocking. We always have to unlock first for increasing or decreasing volume. Please make it more convenient for us, no more unlocking just for volume.
Hello User, Due to Google privacy policy you can't decrease the system volume from the lockscreen. But you can change the media volume if you use to play any music on the lockscreen.
We would request you to register your concern in Samsung Members Application. So, that our concern team gets back to you as soon as possible.
Please follow this path to register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Note. please attach the error log file within 15 minutes of the error occurred.
