Yup, if your WiFi light is gray, it means the Blackberry is not able to connect to the BlackBerry Infrastructure over WiFi. This means that any applications that require Blackberry BIS data will not work.
You can still, however use the browser over Wifi though if you change your Browser settings to "Hotspot Browser"
I think that all your phones are crashing. What you need to do is pay your cell phone bill and make sure that you got the data plan for BIS on it. Then if that doesn't work try reloading the firmware of most recent update from your service provider. If none of those work then what you need to do is call your service provider up screaming in their ear wondering why you got no data. Without data on your blackberry curve its like having a typical phone. But if your one of them people that thinks it is alright to not have data and that you have a blackberry so that your cool. Well, I highly suggest handing over that blackberry so that we will all know it will be put to good use.
Posted from my CrackBerry at wapforums.crackberry.com