My Iphone doesn't recognize my Wi-Fi?

I 've got an Iphone 4, somehow it doesn't detect my Wi-Fi, although my laptop and wife's iphone do recognize the network.
I restored to 5.1.1 but still nothing.
Hardware problem?

That happened to my dads iPhone too. Try resetting the Wi-Fi modem or hitting other under Wi-Fi settings and typing in the name of your Wi-Fi connection and see if it works.

Unplug the router for 30 seconds.

Plug it back in.

When if fully powers on, try connecting again.

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