No special features to turn off.  No connection to you personally, if you do it right.  Much better to keep the two parts of your life separate.

... Has a simple on / off switch on the Settings icon page under Location Services that disconnects the GPS function.

I would assume that there is a way to turn tracking on and off, but that begs the question to whoever is tracking you:  "Why did you turn it off?"  Same with leaving the phone behind at your home or office while you were out.  I suppose anyone could come up with an excuse now and then, but how many times can one get get away with that?

Technology has given hobbyists a lot of advantages over the last ten years with the internet and cell phones, etc.  Now with this tracking ability, it is going to give the married hobbyist a run for his money to find ways to keep a suspicious spouse at bay.

is to turn the unit off completly. During the time that it is off it cannot be tracked with the electronics that are built in.

This is a general but accurate statement. Different carriers have different setups. The capability is built into every smartphone and most web capable phone. iPhone excluded, each carrier determines how their company will track, and how the records are save. Verizon is the most comprehensive, and the most cooperative with le.

Patriot Act eleiminates the need for Court Orders or cause to abtain records from carriers.

For the time being, you can get certain brands of disposable, no contract phones, and register them anonymously. Surely those will go away, just like anonymous Visa cards.

But basically the answer is: If your phone is turned on you cannot stop *its* locatioin from being tracked, and from that information be available to le - spouses and private eyes are a different matter.

If you are familiar with the physics of electromagnetic waves or happen to be a secret agent you probably already know how to get around the problem cell phones transmitting or receiving radio signals.  As a member of one of the communities mentioned above (no not secret agent) I will let my brothers and sisters in on a little secret. You never know what transmission capabilities are built into the phone until its to late. It is better to be safe than sorry. The only way to get around transmitting or receiving any radio transmissions is to place the phone in a small Farady cage.  This way, no, I repeat, no radio transmissions can get in or out.  You can purchase small units on line that shield your phone or other electronic devices.  I happen to wear a Farady cage around my penis ever since the aliens abducted me and implanted a device into my corpus cavernosa.  There is no way in hell that I am going to let those little, wide-eyed, slimely little green mother fuckers get ahold of me again. Believe me, you don't want to know where they put their probes!  

Move to Wyoming. No cell service means nooooo problems. Shit no providers either fuck that shit.