My Wi-Fi for my iPhone 4 doesn't work anymore, why?

My Wi-Fi used to connect right when I enter my house and it maintains connection throughout the whole house, my Wi-Fi network no longer shows up on my Wi-Fi list I haven't noticed any other Wi-Fi networks around town or in the city.

If you upgraded to iOS 6, there's a bug, that reduces Wi-Fi functionality. You can connect the phone to a PC/Mac and download the update that fixes the bug through software update. Otherwise, your Wi-Fi antenna must me malfunctioning, which will need repair. Also, make sure your home's Wi-Fi connection is working and Wi-Fi is turned on.

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