Although an Apple press release stated that the function would not be ready until 9 PM, an iPhone availability locator for Apple retail stores is already working. The mechanism displays a green indicator for stores that are carrying the iPhone (which, at this point, appears to be every Apple retail store in existence) and a red light for stores that are not carrying the device. As previously reported, all of the 164 Apple retail stores in the US will stay open until midnight, after closing from 2 pm until the launch at 6 p.m. The company also announced that customers can purchase up to two iPhones on a first come, first served basis. The iPhone will go on sale at Friday, June 29 at 6:00 p.m. local time at Apple retail stores and corporate-owned AT&T locations nationwide.