Is the smartphone still a kind of node? I mean, does the smartphone add anything to the 'security' of nxt when it is running a lightweight client?
No.
We conclude: This forging smartphone marketing thing is kinda bs. I could state that my penis is forging too, because I leased my forging power. The only difference, for example to BTC, is, that we can run a lightweight working client on our smartphones to make transactions, without the forging (and thus network securing) function.
Bitcoin is at 7 TPS ...smartphones can easily handle that....I think high end smartphones (Note 3 or Iphone 5S) can easily handle 1000 TPS....if you have fast internet.
Do you know for a fact that a NXT forging node can operate without having a local blockchain copy of 300 GB? I don't know that, and nobody has told me that. Somebody tell me that. And my smartphone doesn't have 300 GB of storage.
I think you need the main chain.
And guys, it is not about "omg, we never need 1000 TPS. this is way too much".
It is about:
"Hello, this is Nxt. If you want to kick visa in the ass, here we are. Decentralized, capable of making 1000 TPS. Fuck visa".