I just noticed this today, so I'm not sure if this is normal. Whenever I lock my phone and leave it for a few minutes, it doesnt show the wifi connection and only shows 3G beside the carrier symbol. Is this normal? I tried resetting the Network Settings and it still does this. So basically, whenever I press the home button or power button, screen will light up and show 3G, then after a couple of seconds, it will change to the wifi signal. Normal or not?