Many people thought that a software update would fix the iPhone 4 Antenna reception issues, but there are reports from Mobile Crunch which suggest that it does not do it. This means that Apple will most likely have to recall the faulty iPhone 4 from the market, which again will cost them billions of dollars.
Mobile Crunch have also included a video which demonstrates that the Antenna issues still exist after upgrading to iOS 4.1, check the video below.
iOS 4.1 has some noticeable differences where the signal bars are slightly bigger and the phone also has lesser bars. If you depend on Jailbreaking the iPhone or Unlocking iPhone you are advised to stay away from this update. We will keep you posted when iOS 4.1 jailbreaks and iOS 4.1 unlock becomes available.
You can download iOS 4.1 Beta from here. Please note that you will require a Apple Developer account in order to download and use the latest iOS 4 beta software.