Why won't the flashlight work on my iPhone?

I downloaded the flashlight app and the light won't turn on

I'm guessing for the iPhone 4 maybe you broke the lense for it

I am wondering the iphone you have is iphone 4/4S or iphone 3GS?
3GS has not the flashlight. Btw, if it won't work on your iphone 4/4S, mayba there are some porblem with your iphone. Go to the apple store to rapair it.

_I would like to TravleChina.HK

Why won't my back camera or flashlight work on my IPhone 5c?

My iPhone flashlight has been working fine until this morning now it will not turn on. I have an iPhone 6