AT&T will offer iPhones to customers strictly on a first come, first served basis, and will take no pre-orders or waiting lists for the much-vaunted mobile device.

The company – which recently forbade its US sales teams from taking time off in June when the iPhone is scheduled to launch – has sent an internal memo out, promising training, workbooks and other iPhone product information in preparation for the launch.

The memo warns employees that the specific launch date of the iPhone hasn't been revealed and confirms that "AT&T will be the only wireless carrier in the US launching the iPhone and will have exclusivity for the foreseeable future".

The two-page memo is available in full at AppleInsider.