Pardon my ignorance, I know it's not cool, but I don't know what they can do.

Why

Why?  Because you can be, ’tracked’, that’s why.

A, RFID, (or some sort) of implantable device,  is thought of as ‘progress’ for ignorant sheppol.

“ Oh a What Wonderful, ‘convince’.  No more keys, I can just walk up to my programed, ‘lock’ and it will open, and lock behind me when I am through. Like a car, house, office, elevator, etc.
No more passwords, I am the only one that can use that device, so son’t have to worry about a computer, phone, Credit Cards, Bank accounts.  Oh, How Wonderful”

That is, until, someone cuts off your hand, or just digs out the, ‘chip’, with a dull penknife, to access those things.
OR, until, you are standing on a street corner, and talking about a political party or politician, and if it is the, ‘wrong’ thing.
you, ‘just’, disappear.  Or some horrible, fatal accident occurs.

And it been here for a while now. How many years has it been, that just having this thing in your pocket, you walk to the car it is programed to, and it unlocks, than you just push a button, and it starts?  
A, ’tracking’ device on a moving car.  A ‘recording’ device, on a gas pump, or ATM.  (Collecting your CC  & Pin #)
The US paper currency had to be replaced, then replaced again. Why, With proper tracking devices, The person with the tracking device can, ’see’ exactly how much currency you have.  It was primarily designed, to, ’stop’ drug traffickers and mules, (taking more than 10,000 in cash, out of this country, is illegal) 90% of TSA don’t know how to do this, but 10% DO !

This is NOT, a,  ’theory’.  It is a real life, “ Fact”, that has been going on for MANY more years than it was, ‘available’ to the public.

Take the ‘public’s’, version of the GPS.  Gee, one can go in the boat, mark that wonderful fishing spot, then return to (within 3 feet of it), anytime one wants.  (That’s the, ‘Public's’ version)

That, ’tracking’, ‘can’, be good. and ‘useful’, to stop crime.

But we all know, it could NEVER fall in to the hands, of someone, ‘using’, it in the, ’the wrong way’.

Oh, just a small ad:   I have some Ocean Front property, for sale in Arizona, real cheep,  ye wanna buy some?

What he has done has been to rewrite the NFC chip and by using an Android hack can convince your phone that a much needed update is available (when he stands near you), his chip then uploads a file which convinces your phone to go to his site and download the update, and of course that update is what ever they want to put in your phone.
And all this happens in the back round and you don't even have a clue it is going on.
He is going to demonstrate it at a conference later this year.

I have my phone security set up to ask me for approval for every update.  I hope something like this cannot bypass that.