I recently got my phone back from being serviced, and as I adjust the settings back to my preferences, I can't seem to find the one that allows me to set the time until the screen locks. I am not talking about how long until the display goes to sleep. If I have the sleep timer set to, say, 1 minute, I still want the phone to remain unlocked for some period beyond that, maybe 15 minutes, so that I don't have to unlock it every single time I pick it up. Can someone point me in the right direction, or has this feature been removed in one of the recent security updates? Any help would be most appreciated.