[Edit: I've edited this post by putting what I think the answers are in brackets after having done some Google searches. Please correct me if I'm wrong.] 1) If I am sitting at my desk and I receive a message, it gives a notification sound. If I ignore it for the time being and pick my phone up 5 or 10 minutes later to check the message, it makes a notification sound again as soon as I unlock the phone. Is it normal for it to make the sound both when I receive the message AND also later when I actually turn on the screen to check the message? [Yes this is normal] 2) Sometimes when I am on wifi and my phone has been asleep for awhile, when I first turn it on, I see the "LTE" icon which then quickly disappears and is replaced by the wifi icon. Is that normal? Does the phone turn off wifi and switch to LTE when it is asleep for awhile? Because that is certainly what appears to be happening. [Yes that is what is happening and yes it is normal] 3) I know that I can use the volume buttons to change how loud my ringer and notifications are. Is it possible to put the phone into vibrate mode (and turn the ringer to silent) using just the volume buttons, or am I required to use the little switch by the volume buttons to do that? [You can only silence by turning on DND or flipping the switch] 4) Relatedly, is the only way to completely silence the phone by turning Do Not Disturb on? [Yes, or by flipping the switch but having all notification vibrations switched to OFF] 5) Under "Location Services" -> "System Services" do I need to leave "On" Cell Network SEarch, Compass Calibration, and Setting Time Zone? I already have Diagnostics and Usage, Genius for Apps, and Location-Based iAds switched OFF. [Nobody really knows. They may be assisting the phone to function in some way, or they may be purely a mechanism for Apple to collect data about you.] 6) How does automatic brightness work? I previously turned it off and set my phone to about 20% brightness. But earlier today, I was in a completely dark room, I turned the brightness slider all the way up (it was really bright), and then I switched automatic brightness to "ON" expecting it to decrease the brightness accordingly since I was in a completely dark room. To my surprise, it did absolutely nothing. Does it just take it awhile to work? Or should it be working instantly as soon as I turn it on? As far as I can tell turning it on did absolutely nothing for 5 or 6 seconds, and then I just switched it OFF and manually decreased brightness. [Yes, just takes awhile to work. If you set the brightness slider to minimum and turn on Auto Brightness, it should work, even if only gradually.] I think that's all for now. Many thanks for any assistance!