Why isn't my Wi-Fi working on my IPHONE 4?

It's since 2 day that i'm not being able to access wi-fi connection on my IPHONE 4, please tell me a solution to this problem…

Check your Wi-Fi zone settings, else maybe you can do a soft reset of your iphone. Update the firmware to the latest although don't think this should be the main factor.

The same is happening to me and I can't even press the button for Wi-Fi! Please help
Me! I'm wasting storage on my phone and my parents will get mad!

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