Like a lot of these things I hear about them on Facebook when I'm on the bus and Hearthstone for the iPhone is no different. I was itching to play it all day and finally I got to play it on my iPhone.
So let's talk about the game. Hearthstone is a Warcraft based card game for just about all mobile and desktop platforms. If you have played it on the iPad or your desktop nothing has changed game play wise. But the UI had to be tweaked for the smaller interface. It might take people who have played it on the bigger screens to adjust to were your hand is but that should really just take a minute.
Over all to me the game is solid you need about 1 GB of free space also about 10 mins minks to play. Though I know I can easily play it for 3 hours and now that I can play it on my phone I'm sure there isn't going to be a time I'm not playing it now. Also with the new Blackrock adventure mode there is plenty to keep you busy if you need something to do.