I'm still on the fence for upgrading from my current iPhone to the IP4, but I read on a post that the below comment apparently worked.  For those that have the 4 please give it a try and see if it works for you.  Please respond with your results.
Hold the phone "the wrong way" until the signal drops to no bars. Go to Settings - General - Reset - Reset Network Settings and reset the network setting while holding the phone so that there is no signal. When it comes back up it should be resolved. I have been holding the phone "the wrong way" for 15 minutes and 5 bars strong.
If it does then my decision to upgrade will be for sure.
The post was from the iPhone 4 Fan page on Facebook.
				
			Hold the phone "the wrong way" until the signal drops to no bars. Go to Settings - General - Reset - Reset Network Settings and reset the network setting while holding the phone so that there is no signal. When it comes back up it should be resolved. I have been holding the phone "the wrong way" for 15 minutes and 5 bars strong.
If it does then my decision to upgrade will be for sure.
The post was from the iPhone 4 Fan page on Facebook.

 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
			
		 
 
		 
 
		