Cupertino (CA) – Oh where have all the iPhones gone?  Apple is having trouble stocking its wildly popular iPhone in retail stores and its completely unavailable on the United States and UK online Apple Store.  Apple says there is no word on when it will get new inventory and this isn’t necessarily a bad thing since everyone anticipates the 3G version of the phone to be announced next month.

We did a quick check on the Apple online store and sure enough both the 8 GB and 16 GB models of the phone are “Currently Unavailable”.  However, several people have confirmed that many retail stores still have the iPhone in stock, although it is getting a bit more difficult to find.  Apple spokesperson Natalie Kerris told Reuters that the iPhone is “out of stock”.  So the stores are probably just going through pre-existing inventory.

Apple’s Developer Conference is on June 9th and everyone expects Steve Jobs to announced the next-generation iPhone – capable of supporting 3G speeds.