Locate and download an iOS 5 beta IPSW file, these are all over the web but you?ll have to find it on your own
Launch iTunes and Option-Click (Mac) or Shift-Click (PC) on the ?Check for Update? button to restore the iPhone
Select the iOS 5 beta IPSW that you got in the first step and upgrade the iPhone
When the iPhone is done updating, you will see an activation screen, ignore this
Grab the iPhone and triple click on the Home button to activate Voice Over
Triple click on the home button again and the Emergency Call screen will appear
Tap onto Emergency Call, and while it?s switching to make the call, swipe three of your fingers down on the screen ? this is the new downward swipe gesture to activate the Notifications Center
Now that you?re inside Notification Center, tap on the Weather widget to load the weather app
Now you can click on the iPhone Home button, and you?ll exit Weather app to be on the iPhone springboard
You?re now in iOS 5 beta