Cannot turn on wifi

Hi Aishuos,

welcome to the Apple Community!

Re: "I can’t turn on my wifi. I did everything. But cannot turn on. The button is gray"

Wondering if you tried restarting your iPhone ... will often restore order:

Eg: How to: Restart your iPhone - Apple Support

and

if you have the latest iOS update on your iPhone:

Eg: About iOS 16 Updates - Apple Support says iOS 16.4.1 is the latest.

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Else:

Wondering if this is the "I did everything" you've already tried:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

and

Troubleshooting: What to do:

If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

or

If you can't activate your iPhone or iPad (Wi-Fi + Cellular) – Apple Support

All the best :-)