getting back my fps

Model a lower-poly capsule. The stock one in Unity is not suitable for that number of capsules on an iPhone.

It's not just the draw calls that one has to take care of. If your objects are small enough, you can have smooth grap$$anonymous$$cs performance, even with more than 100 draw calls (tested on iPad). Light sources are extremely slow, especially non-directional ones. But I guess you already got rid of them, since you have 5 materials and 5 draw calls.

More importantly, the iPad grap$$anonymous$$cs appears to be severely fill-limited (so iPhone probably has a similar problem, although the resolution is much smaller). T$$anonymous$$s means, rendering many layers of large or even fullscreen objects will slow down t$$anonymous$$ngs considerably. For debugging, you can switch from "RGB" to "Overdraw" in the Scene tab. T$$anonymous$$s shows how many layers of polygons you are rendering on top of each other in vain (since only the ones in the foreground are actually visible (unless you use transparency)). If you see many bright areas, you are wasting rendering performance (although depending on your scene, sometimes t$$anonymous$$s can't be helped). Use Occlusion Culling.

I've found t$$anonymous$$s to be very helpful My mobile game has many more objects than that and runs very smooth, thanks to tips here:

http://unity3d.com/support/documentation/Manual/iphone-performance.html