I replaced my iPhone 4. The Home button was spoiling, it would mix up 0, 1 and 2 clicks. The service centre for iPhones in Singapore is this out of the way place. They gave me a refurbished one. I was worried there would be scratches, since I don't expect them to replace the exterior for every iPhone, but somehow it was perfect. It came with protective plastic stickers on the front and back like a new iPhone has. I wonder what they do to the outside? I'm also slightly worried about the battery.