I bought the Iphone 3g on launch day here in Canada. After taking good care of it by being careful, buying the 20$ rubber case & 25$ for the Invisible shield. Anyways, after looking at my screen (when it's off) for scratches in the dark, I noticed a oil / rainbow circle on my screen near the bottom. Now I hear this is normal? Is it really? and How will it affect the phone/screen in the 3 year death sentence I took with rogers? Any help would be nice. Thank you!