My iPhone 4s doesn't connect to Wi-Fi anymore?

Well i have had my iPhone 4s since April and it connected to Wi-Fi before for awhile and now its been a week and i haven't been able to connect anymore? I have tried reseting my network settings and my whole phone! And that has not worked.plus i know my Wi-Fi works because my computer internet works. I need to connect though because it won't let me update to the new IOS 6 without being connected. So if you know how to get the Wi-Fi to connect again or how to update my iphone without being connected, please tell me!

Call the apple store.

1-800-MY-APPLE
(1-800-692-7753)

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