I ordered a white iPhone 4 conversion kit from www.iphone4parts.com because it's on sale for $109.00.  Before ordering, I emailed them and asked about the quality of their parts.  Here is their response: "All our parts are made from the highest quality materials to OEM specs."  I made the switch last night, and now I have two problems.  First, the home button does not sit flush with the rest of the glass.  It's raised up just a bit.  Actually, the white plastic that surrounds the outside of the front glass is raised up a bit too, making me thing the glass is actually too thin.  Second, the proximity sensor plain doesn't work anymore.  The screen will not turn off during a call no matter how much I cover the sensor.  So, my question is, did I do something wrong during installation, or do I just have defective parts?