The same thing happened to me. Here's how you change it.
1) open "settings"
2) open "security"
3) click on "screen lock"
4) enter your pin where...
to me, it sounds more like a network issue. did you try it at a place where there's strong signal.
hm...mine seems fine.
so even you tried to increase the volume, it's still low? how about your friends one, are theirs lower than yours? If it is the phone defect, then...
have you got it solved? If yes, please share your solution here so that others can benefit. Thanks.
You may just turn off the phone every night, and then see how it goes. It must be some app running in the background.
Now I win, but later I will loose unless this ticket will be locked after my post:-)
I have the same problem, however, none of the above solution helps. Anyone has any other suggestion?
I have found the solution. just for...
I have the same problem and reported it to face book, waiting for reply.
Did you enable auto recall? You may take a look and disable it.
Wellcome onboard, I am also new here.
You may bring your phone to the service center to take a look.
nice to see you all here. wish to talk to you all later.