Apple begins to roll out iOS 4.1
Conversely, it'd be a wise idea to stay away from installing this update if you happen to be running a jail-broken device until some thing comes along the way to correct it. But for everyone else, just be sure to backup all of your data before proceeding to install the update. Again, iOS 4.1 brings forth a myriad of new features such as high dynamic range (HDR) photos, Game Center, and a host of bug fixes such as one that resolves the issue with the iPhone 4's proximity sensor.
Apple iPhone 4 Specifications | Review