Additional info: iPhone and iPad recognize high-current capable USB ports on a particular circuit. This includes the adapters, and prevents so iPhone / iPad is loaded more slowly than necessary when it connects to 'normal' USB ports / power supplies.
Addendum July 2014: Without further wiring of the data pins flows in Apple devices 0.5 A. The units are therefore actually loaded, but so slowly that they themselves report no charge.
With this adapter, the two data pins to 2.7 V (D) and 2.0 V (D +) are placed (input and output are not connected). Therefore invite Apple devices with about 1 A (5 watts), which corresponds to the small iPhone Power Adapter. Had the Spanungen reversed 2 A (10 W) flow would even (only if you connect a iPad, the iPhone remains at 1 A) - damage to the motherboard, etc. included. So no better.
Who, however, is so reckless as I can use an adapter which short-circuits the two data pins to USB Spec. Then the Apple iPads load just as it is in the Spec - namely with almost 1.5 A (7.5W). The suitable adapter is available here as a 'Portapow quick charging adapter' in nice red warning :-)
