According to some reports online, if you look hard enough in the “grey market” in China, you can actually find some 64GB iPhone 4 devices available for sale. These phones are rumored to be iPhone 4 prototypes that got the axe (as evident by the lack of 64GB models available now) and come marked with prototype model numbers like XXXXX and FCC IDs like BCG-XXXXXX. These phones even carry the XXGB marking, similar to the infamous iPhone 4 that Gizmodo managed to pick up at a bar last year, giving more credibility to rumors about the device. It has also been reported that the device is unlocked, so you’ll be able to use it on any carrier. It hasn’t been mentioned how much the phones cost, but if you do manage to get your hands on any of them, do drop us a comment. I wonder why Apple decided not to include 64GB in their final iPhone lineup. Chances are they did it to keep the cost of the iPhone 4 the same as the previous generation models. What do you think?