IPhone 5 warranty issue

I've got 2 questions one is why are these black bubbles shown when I take a picture with the phone camera

Images:

[url=//postimgs.org/apple-touch-icon.png

[url=//postimgs.org/apple-touch-icon.png

[url=//postimgs.org/apple-touch-icon.png

And my main question is why I get this when I enter my serial no for my iPhone 5 I just purchased from second hand high street shop

"We're sorry, but this is a serial number for a product that has been replaced. Please check your information and re-enter your serial number. If your information is correct, you may need to contact us."

//postimgs.org/apple-touch-icon.png

Working link sorry those round grey things it's from the phones lens it has no protector there

Dust or dirt on the lens

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