A black iPhone 4 prototype has appeared for sale on eBay and the highest bidding hit one million U.S. dollars as of Monday, according to media reports. The listing is set to expire on July 11. The seller \"jtmaxo\" said, \"I am a licensed cell phone repairman, this iPhone was bought from a person who really didn\'t know who he had.\" The seller later was frustrated to find that it was unable to be activated via iTunes. According to a check through Apple’s database, it is indeed listed as a prototype, and it has the tester code \"DF1692\" etched in the bottom right corner. Different from the iPhone 4 sold on markets, the handset lacks the + and - on the volume buttons, although the screen is fully functional. The price for the prototype will not remain as high as it is as the seller said that several \"non-legitimate\" bids have already been deleted.