Smart phone based OBD readers?

So as I'm about to do the fly and drive to pick up a new to me Disco, I have my first productive question. Yes, I searched, but didn't get anything.

Anyway, I have an application on my phone that uses a wifi dongle that plugs into the OBD-II port and provides data. The Disco I'm getting is an '01. The program is OBD Fusion and I've used it very well on the Jeep (a '12) very successfully.

So will I get any data? Will I screw up the ECM? Since it's OBD-II, I'd think by emissions law I'd get something.

I'm guessing I won't get too much appreciable and don't know architecture of these things well enough to know how much use of CANs they use.

Sorry if this is a dumb question, but I've been wondering and it might give me a bit of a toy to play with while driving.

Cool, thanks guys. I've already got it- I just wanted to make sure I wouldn't send hounds of hell after me for hooking something up. Torque is the benchmark by far, but I've suckered into the Apple ecosystem.

I'm not a total noob on this as I've spent a number of years in the telematics industry.

Yep. I'm aware of a good bit of this, but just wanted to confirm before doing it.

Everyone's input is correct, iOS doesn't play well with BT stuff, so wifi is the best option. I've spoken with the lead developer (actually the owner of OBD Fusion- really cool guy) and talked about a lot of it at length and actually worked with OEMs in my career in getting an enterprise level solution in place. Basically getting the keys to the castle in them providing the proprietary PIDs without having to reverse engineer. It's very cool stuff.

I've just never had a British machine before and as with my older BMWs wanted to make sure the electrical system wouldn't go boom by hooking up an outsider.

Thanks for all the input.

OBD Fusion worked perfect for the 500 mile drive home. Gave me battery voltage, instant economy (if you can call it that), and coolant temp. I still need to check if I can get oil pressure or temp, but it definitely was nice to have it for extra peace of mind during the long drive. I got readings from the O2 sensors a well. I'll monkey with it some more, but definitely am happy with what I got.