guoweiming wrote:
This seems to be a bug of the silence button. After you turn it off and turn it back on (red hidden), you would have to
go to settings and unlock the sound as following:
settings--> sound-->lock sound
turn it off, and then turn it on.
The sound will come back.
I missed a month of my incoming calls before I finally figure out the problem.
All that setting does is turn on or off the sound the button makes when you lock or unlock the phone. It has nothing to do with Do Not Disturb, ringtones or any other sound. While it's great that your phone is now working properly, that's most likely not the reason.