Wi-fi will is not scanning on my iPhone 4s?

Recently my iPhone's Wi-Fi just disconnected after working perfectly. Nothing happened and it stopped. I realised my Wi-Fi network was disconnect so I tried scanning for it but my iPhone takes ages then says 'can't scan for wireless network'

My other devices work perfectly and I even tried resetting my wireless router but that wasn't the case. I tried resetting the phones wireless settings and even done a full reset. This didn't work either.

Does anyone know what I can do to make my Wi-Fi work again?

I would try resetting the network settings… Go to settings-general-reset and reset network settings.

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