My PS Vita can't detect my Wi-Fi connection: c?

Hello to all who are reading this, I hope that you can help me.
I own a PS Vita and I'm from the Philippines, after a few months my PS Vita suddenly can't detect my Wi-Fi but my other devices like my iphone and psp can detect it. I think it happened after I registered my my Wi-Fi mac address to skyhook. I tried to restore the ps vita system in the settings menu but I my PS Vita still can't detect my Wi-Fi: c Has anyone experienced this problem too?

Maybe you didn't pay the bill? Hey its happned to me… Or if your bill is payed maybe call the company that you if internet with they will help you out…

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