Why won't Wi-Fi come up on iphone 4s?

I can turn the Wi-Fi slider to the on position but no Wi-Fi is coming up i have Wi-Fi in my house and i've tried with other Wi-Fi servers and it still shows there's no Wi-Fi in the area help?

Because it has been disabled.

Sounds like there's something wrong with router because you couldn't search for signal at all. You can try to reset your wireless router. If it still couldn't work, you can connect your laptop with ethernet and turn it into a hotspot with My Wi-Fi Router software. Then you can try connection again.

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