I can't seem to attach an image to the post but I have uploaded below. The sweet spot is in the red circle, about 1cm under the NFC logo.
Posts made by Legs
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RE: Xperia Z2
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NXT coin
I think I have found a crypto currency that could work very well with the ring.
NXT is a new currency that does not use Bitcoins code and operates in a different way. Your wallet can be accessed anywhere from a browser or any NXT app. The wallet is unlocked with an alphanumeric security key.
The security key is chosen by the user when they first open the wallet and as this is the key to your coins it is recommended to choose a complicated key that cannot be guessed, in steps the NFC ring.
I have used NXT a bit and have had to keep my key in a plain text file on my phone as it's so long to memorise, I think many users are in the same boat. I'm going to start keeping the key on the private side of my ring and see how I get on. I'm sure with some integration the ring could work really well with this platform.
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Xperia Z2
I am pleased to report the ring works perfectly wit the Sony Xperia Z2. The phone has an NFC logo on the back that indicates the sweet spot however I have found the ring reads best about 1cm under the logo.