The white iPhone 4 came out earlier today, and it looks just like a regular black iPhone 4...only in white. While Apple doesn't list any size difference in their Tech Specs page, Ryan Cash of Marketcircle notes on his personal blog that the white iPhone is actually slightly thicker than the black iPhone. As you can see from the photo above, and others after the break Ryan kindly sent us, it's not the steel enclosure that's thicker on the white version, it's the plastic. Sure, it's a very minimal difference that may not even be spotted from these photos, but it's there and it may cause problems when trying to fit the white iPhone in older iPhone cases. I'm sure not so many cases will have this problem, but the difference is visible when comparing the devices.
A colleague of mine just picked up a 16 GB iPhone 4 in white. I was a bit surprised when I picked it up off his desk (I had my black 32 GB in my other hand at the same time) – it immediately felt thicker.
We placed them side-by-side on his desk, and sure enough, the white iPhone was a hair thicker.
Have you purchased a white iPhone today, and it doesn't fit in the case you already have? Let us know in the comments. More photos below.
Update: TiPB notes the white iPhone is 0.2mm thicker than the black iPhone. They're testing different cases updating with results in their post.