Why won't my iphone 4 work on any Wi-Fi?

I got a iphone 4 for christmas… Ikr. Anyway when i connect it to Wi-Fi at my home it says its connected but when i try to use apps it says its offline.i've tryed everything, reseting the motum, even reseting all the settings Please help

Could be that that iPhone's Wi-Fi system is not functioning properly.

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