I decided to take the plunge today and use the new sn0wbreeze for windows to create custom firmware for iOS 4.3 and jailbreak my iphone 3gs, tethered of course. After reinstalling all my apps, contacts, sources, cydia files, updating mobile substrate I no longer have 3g and can not make or receive phone calls. I basically can only use WiFi. Before i go ahead and downgrade back to 4.2.1, has anyone experienced this problem, or know of a way to fix it? I dont mind downgrading and going back, it'll just be a pain since I just finished everything. Any help would be appreciated. Thank you.