According to German site Apfelpage, mobile operator Deutsche Telekom has started informing their customers waiting for a contract renewal that the new Apple smartphone will be available on September 19.
The iPhone 6 will be available to the operator at that time directly from Apple.
The Apple keynote should thus take place in early September, ten days before the launch.
The information seems realistic as the iPhone 5 arrived on the market on September 21, 2012 and the iPhone 5S and 5C on September 20, 2013.
A report earlier this month announced that superiors at German Apple stores instructed employees not to take holidays during the month of September, a hint that the device could be launched during the specified period.