[Azrial]

The problem is that I have to use the lock screen in the environment that I work in, to prevent tampering.

I was really worried about this as sometimes I need to make phone calls very quickly. Then I realized that through EPST I could define up to 8 extra numbers of my own choosing that I could call via 3 number shortcuts directly from the lock screen keypad. I could get 9 if I deleted 112, the European Emergency Number.

Of course the phone will remain "locked" to all other use, but this also works well for me, as I do not have to take the time to re-lock my phone.

Is my situation unique, or has someone else tried this?