I noticed something very strange tonight.

I have 2 iPhone 3G's - one is an italian unlocked 8GB and one a locked UK 16GB.

The 16GB is shielded so that when I get a call I don't get speaker inteference when on my computer like now.

I thought that was a standard specification on ALL 3G iPhones.

Then I noticed buzzing coming from my speakers tonight - at first I thought it was another phone I had near the speakers but I removed that and it still happened!

So I made a call on the unlocked iPhone and it was buzzing the speakers!

Either - sheilding is NOT standard on all iPhone 3G's and it depends on the country they come from or I have a seriously faulty iPhone 3G!? (although buzzing speakers isn't really a fault lol).

http://www.ifixit.com/Guide/First-Look/iPhone3G

Just scroll down to the end photo of all the parts and it clearly shows and is annotated as the EMI sheilding!

Now I admit the italian iPhone is unlocked so maybe its hardware is already different (assuming the unlock is not software based that is!) but it seems strange that one is buzzing my speakers and the other is not!

Personally its incredibly annoying when you have two phones which look identical but obviously are not!

Has anyone else experienced interference from their iPhone 3G?

I figured it out!

Another advantage of 3G!

I had my unlocked phone with 3G turned off - to save battery.

I turned 3G back on and speaker buzzing no longer happens!

Learn something new everyday!