One thing I have noticed after switching to an Iphone 3GS is that Vodafone have far better and more reliable reception than 02... and the sound quality when talking on the Iphone is SHITE! its muffled and distorted badly sometimes in my ear on some calls....

and it NEVER works properly when I want it to! like now... just wanted to upload a photo to post on photobucket... and guess what. No celluar network connection!!! even though the phone says full service and 3g available!