My iphone 4 suddenly unmounted sd card?

I was listening to music…
i suddenly got a call from one of my friend. When i finished my conversation with her…
I see that my sd card is unmounted.
i don't know what to do
so please help me find a solution!

Apple Iphone 2G/3G/3GS/4/4S/5 and even the new 5S budget class and the new 6 don't have a SD Card… Nor have a SD Card slots…

your argument is invalid…

I have no idea wtf you have as a phone, but it is not an iphone!

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