I have an iPad and an iPhone. You can do very little Fusion Cash on any mobile. I have been able to do the daily email but it is difficult to do on the mobile and I soon gave up. Fusion Cash does not yet have an app and you will get a warning that you are taking offers at your own risk -- that you may not get credited or have a bad experience. If you get an iPad and attempt Fusion Cash, you should only do so with cellular data and not wi-fi.
I recommend an iPad but do not recommend attempting FC on any mobile.