I bought a used iPhone 3G 8GB on Craigslist for $120 for use on the T-Mobile network and the only problem (so far) that I've noticed is that the screen appears to have a strange 'space' on the bottom left & there are blue dots when the screen is black. Googling, I found round 'bubble' problems, but I couldn't find any pictures (in images.google.com) of the same irregular-shaped bubbly defect/problem that I see on my screen in the photo below. This defect (see photo below) doesn't appear to hamper use; but I'm wondering if it will spread - and - if it's something I 'should' worry about (and, if so, how to fix it). Thanks, in advance, for any advice you can provide. NOTE: It's hard to get this in a picture because of the lack of contrast.