WHY CAN'T MY IPHONE 3GS CONNECT TO INTERNET EVEN WITH Wi-Fi?

Ok so i updated my iphone 3gs to ios 6.1.3 through itunes, but you know it wasn't activated, so i jailbroke it to have access to my phone. But even though my iphone is connected to Wi-Fi.cydia and safari and other apps still say no internet connection. That is the same what happened before i updated the phone cydia and other apps said no Internet connection.oh i have taken my sim card out because my iphone isn't locked to it, and i needed to take it out because i can't unlock it with ultrasn0w if it has a sim card inserted. So please which is the problem and how can i fix it?

Can you call? If you can't call it mean you iphone baseband are broken it can only use ask ipod.
if you can call Mean it ok reset the setting if it still not work buy new sim card.

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