I want to buy an iphone, but dont' want to spend much money so that I make up this thread. Technical products launch in the market everyday, or every month, want to try them all, but unluckly, my buget is limited, so please be kind to tell your use experience to me, or other people plans to buy a new iphone. is it really necessary to upgrate to 3GS? leave "yes" / "no", and a command of your view. Thanks alot.