Did you choose sRGB under Color space in the export dialog when exporting?
Is your monitor calibrated?
If so, there is not much you can do. Mobile devices are not color managed.
Having said that, images look pretty good on my Huawei P6.
yes i did choose sRGB under the exporting options
the issue is that the pictures looks very good after exported over the laptop screen but over saturated and dark over iphone screen
as far as i know iphone screen are automatically calibrated and the color depth and management over them is perfect
iphone screen are automatically calibrated and the color depth and management over them is perfect
Who told you that? Apple? Sorry, there's no such thing. There's a little more to calibration and color managed displays than that.
However, some new mobile screens are probably a bit wider than sRGB. These screens will display sRGB a little oversaturated, since there is no color management there.