Apple's new 5.5-inch iPhone will come several months later than the new 4.7-inch model in order to avoid competition between the two models, rather than due to poor yield rates at 5.5-inch production lines as being reported, according to sources in the iPhone supply chain.

The different timetables have been set as Apple does not want to repeat the mistake it made in 2013 when it launched the iPhone 5s and iPhone 5c simultaneously, said the sources.

Yield rates have not been an issue for the large-size iPhone, as well as for the speculated iWatch, and therefore, member companies of the current iPhone supply chain will remain unaffected, the sources asserted.