Mining cryptocurrencies in smartphones can be done since years, but it has never been really developped, mostly because of devices prices and low performances. I've been always worried about this kind of mining, because mining on a mobile device can be dangerous with the lithium battery which is stressed by heat and abusive plugging time.
We all know what happens to a defective lithium battery : burning or explosion.
I wouldn't try if I would like to keep my device alive a long time
I would not even think about it or try it as well, considering the amount I bought it. These are expensive gadgets and if I want to mine, there are miners specifically made for that, so trying to get the life of my phone screwed up because it gives me the chance to mine, then that is crazy. Unless of course after some years, some who have enough to throw away by taking the risk can come to give their own testimonies, then I MAY consider that.
It is good if they are trying to integrate mining ability into the mobile space, and Samsung has really been doing pretty good trying to stay on top of their game in the smartphone industry. However, like some have said, this would be the biggest mistake anyone would ever make trying to use their phone to mine, and no matter how strong it may be, if that is your sole purpose for buying the phone, then that is not wise spending at all.