My phone used to auto lock the keyboard after about 20 seconds of inactivity. I received an update and after installing, I lost the Lock icon and the auto lock function. Can someone help me bring these back?

I know I can lock the phone by holding the "*" key, but I want the auto lock back. Also, the only way to unlock it now is by hitting the mute button. I don't like this. I want it back to unlocking by hitting the "*" and then "send" buttons.

I also want to have the Lock icon back on the main screen.

Thanks in advance.

You need to set a password in order to have that functionality now.

Or else roll back to the previous OS version.

...

How do roll back?

Thanks