I just want to share with you a good deal.
Daz3d is making a promotion by offering for free, 3 tools:
DAZ STUDIO PRO was $429.95 / NOW FREE
BRYCE 7 PRO was $249.95 / NOW FREE
HEXAGON 2.5 was $149.95 / NOW FREE
I personally know only bryce 3D from old-time. But forum feedback on this softwares are good.
It should work with Unity and help you make Iphone App. There is a forum threat on Unity Forum.
I advise you to grab while it’s free : Free 3D tool.