I did get it going after a few abortive attempts.
Know this, if you have an S3, you have to turn on both NFC and S Beam
You have to have the Panasonic Image App installed in the phone
I've only had the camera for about 5 hours so I'm happy it wasn't THAT hard to get the app set up.
Many people have complained about how fiddly setting this up is - and I imagine you really have to know both the camera and the phone settings!
If you Google setting up NFC with the Panasonic GX7 you will find a few links that will help you out. I'd like to be more specific, but I honestly don't remember what worked best!