Apple just released a third beta version of the upcoming iOS 5.1 firmware (Build 9B5141a), which you can download over-the-air update for existing iOS 5.1 beta users or through Apples developer area. This updated Beta includes some bux fixes and also restores the Enable 3G toggle in the Settings app which has been strangely absent on the iPhone 4S since its mid-October release. » Apple Released iOS 5.1 Beta 3: Enable 3G Toggle Is Back