Anyone know if there is a way to "LOCK" settings on an iPhone?

[Model35mech]

The iPhone that I use seems to not hold its settings.

We've learned how to find the menu to select "allow all calls", but, yet, many phone calls often never result in the incoming ringtone. Days afterward when one of us bothers to check "recent" calls we will find a phone number that we never picked up. And I suppose due to HIPPA rules, no voicemail is actually recorded.

Our lives really don't revolve around the phone and I don't carry it. I don't really have any of its menus memorized. I get 3-4 calls directed at me per year outside of the periods following 6 month check-ups etc, when there is more telephone use. We deem health related calls important and don't like to miss them. It's common for the V.A. to call just once. If you miss it, you missed it. They won't call again. It's not really the path you want your internal medicine exam results to drift off into the ether.

Even our refrigerator has dependable a way to "LOCK" its settings, I wish I could master that for the iPhone.