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I have the same stuff with my screen. Two big white spots and I cant stand it. Dealing with Customer Care now to get it fixed. Still within my 30 days, so we will see how its goes. Annoying to say the least.
Has anyone been able to get a replacement through Sprint with the manufacturer's warranty? I feel like my spot is getting bigger :/
Yup. Got mine replaced with no issues by Sprint for the same problem. Did it about three weeks ago.

I have this issue on a 003.I am still within the 30 day return policy actually. How will I know if they stick me with a refurb? How can you tell they're refurbs?
I had an Evo with the 'B' spots. Got it replaced by Sprint. New device great, then a month later, another 'B' spot. I have a feeling they are pretty common, but people aren't paying attention to it. The spot has got worse over the past couple of weeks. Don't know if I should bother getting another replacement.