How to manually turn on flash on iPhone?

djibber wrote:

I know how to turn the flash on manually when I want to, but there does not appear to be set the default option so that the flash is on. When I select the on option after pushing the arrow, it does not save this setting for the next picture. When I close out of the app and open it again, the selection is back to auto. Please tell me how I can ensure that every time I want to take a photo, the flash is set to on by default.

[Re-Titled by Moderator]

ref:

Use iPhone camera tools to set up your shot

If the camera or flash on your iPhone, iPad, or iPod touch ...