Auto dim settings on Iphone

I stupidly took off the auto dim on the iphone and now the screen is blank and i cant see how to get it back. I tried turning it off, touching anywhere on the screen...
please help!!

Something else has to be going on. Despite making brightness changes to the iPhone, you cannot turn the screen completely off. I would try to do a reset, hold the sleep/wake and home buttons together until you see the Apple logo and then releasing. Once the iPhone restarts, see if the screen responds. While it can be dim, it doesn't go out completely.

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