Unity3d draw call count differs between platforms

I'm currently doing optimization for my mobile game. In unity editor, my game runs at over 100 fps with 15-25 batches and set pass calls, but once I build my game (Android) and put it on my phone, the number of batches dramatically increases towards 150-200, and set pass calls to 80-120; The fps also drops to about 30-40.

I have read somewhere that the number of draw calls should stay the same between platforms, otherwise what's the meaning of the stats preview window in unity editor?

Thanks in advance.