Hey guys. I bought an iPhone 3g from my friend fairly recently. However, I have noticed that dust has started to collect underneath the screen. Also, I'm having some issues with the backlight where it just simply goes out and does not come back on even after playing with the settings. I live in Ottawa, and there is no Apple store nearby. What are my options? I have taken my laptop to an Apple authorized repair shop in the city, but will they be able to replace my phone? Any help is greatly appreciated.