IPhone 4 says connected to wifi but shows 3g connection.  I've tried turning off 3g - that does enable the wifi logo, but then when I try to connect to something it changes to 2g.  Tried resetting network connection in general setting.

I've tried everything.... I see this problem all over the web, but no one seems to have an answer... so I know it's not just me.  Laptops and other wireless devices connecting fine, just iPhone 4 has problem.

When you say you have tried "everyihing" that doesn't provide enough information to help you, as one person's "everything" is quite different from another person's "everything". In the absence of knowing what you have tried, the following are the most common causes of this problem.
Turning off 3G will just switch you to EDGE. You can turn off Cellular Data, but that won't make it connect to WiFi if your WiFi isn't working, it will just eliminate all data access to your phone.
Easiest to try answer if it is only your home WiFi, and it works other places:  Reboot your router.
Next, update the firmware in your router.
If it doesn't work with any WiFi anywhere first Reset Network settings. If that doesn't fix it, restore the phone using iTunes.
You didn't say what symptoms you got, or when you were trying to use WiFi. You do know that the iPhone turns off WiFi when the phone is on standby to preserve battery, right? So if it only fails to connect to WiFi when you are not actively using it that is normal.

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