This Is A Running List of iPhone Tips as I come across them or discover them.
The following were added October 24, 2017
Hands Free, Siri & MeSince iOS10 at least, and on the iPhone 7 series and later, (if not before), you could make your iPhone completely hands free for things like making calls over speaker, setting alarms, reading and making messages. This means setting your iPhone into "always listening" mode. After extensive testing, this has very very very little impact on battery life. Unlike some of the Android phones I've had, where it actually did have a noticeable impact on battery over the course of a day.
Go into "Settings", down to "Siri & Search" and make sure Listen for "Hey Siri" is active. From this point on, you can turn the screen off, put your phone on the table, and without touching the device, trying saying things like:
"Hey Siri, Message to So-N-So, Lets have steak on the barbecue tonight."
"Hey Siri, Read My Messages" and it will actually prompt you one my one to read your messages, reply, skip, etc. Pretty cool.
You can also expand upon this by saying instead,
"Hey Siri, Read My Notifications" and it will instead include ALL your notifications. This is fantastic if your hands are greasy (eating that steak from the Barbecue), or you are otherwise occupied, perhaps playing your Android phone that requires you to actually touch it.
"Hey Siri, call So-N-So on Speaker."
I haven't found a good way yet to ANSWER a call hands free except for the Auto Answer function which answers all calls..., but if I do and can verify I'll be sure to post. I actually haven't tried this Auto Answer function, and while this sounds close to the solution, it does require that except step of remembering to turn it on first, then off.