I've always thought it would be awesome if I could have my snapper card incorporated into the phone I have currently, today I was reading about the technology when I came across this website http://www.woebken.net/future_of_money.html (Scroll down a bit to the oyster meltdown video)
The site showed an oyster card being soaked in acetone then having the plastic layers of the smart card removed one at a time, looking at the diagram on the snapper website I concluded they both have the same layout so the same idea should work on a snapper, although I am yet to test the final result.
I went and purchased a blank snapper ($10), acetone, and found a glass jar and tweezers. After soaking the snapper card in the acetone in a jar for around 10 minutes I was able to remove the colored layer of plastic on the card, I continued to do this until all I had left was one sheet of plastic where I could see the RFID chip and the aerial loop. I peeled the final layer off and was left with the aerial loop and connecting to the RFID chip.
It's currently taped inside the back of my phone waiting for a test run later, will be interesting to see if it works or not, I don't see why it wouldn't but some shop owners or bus drivers may be reluctant to accept it (I don't blame them)
Just thought others may be interested in this, I don't believe it is illegal but also don't think snapper would approve of it so this one is just for fun, I still have my normal undamaged one for frequent use.
Please correct me if you think any of my reasoning is wrong, I would be interested to hear other peoples views. Cheers