Makers in the iPhone supply chain are set to see strong sales in September thanks to incoming orders for new iPhone devices which are due to be unveiled in early September, according to sources from the supply chain.

Most suppliers have become more positive about shipments of the updated iPhone devices recently due to higher than expected orders from Apple, which were originally perceived to be affected by sluggish global economy and weakening smartphone demand in emerging markets, said the sources.

Incoming parts and components orders for the new iPhones are even stronger than orders for the iPhone 6 devices in the corresponding period of a year earlier, indicated the sources, adding that shipments of updated iPhones will once again squeeze sales of other vendors including Samsung Electronics, Sony Mobile Communications and LG Electronics, commented the sources.

Thus, sales of the new iPhones are expected to dominate smartphone sales globally in the fourth quarter of 2015 as current sales of LG Electronics' G4, HTC's One M9/M9+ series products and Sony Mobile's Xperia Z3+ have been lower than expected, indicated the sources.

To lessen the impact of the release of the new iPhones, Samsung has been implementing a "Ultimate Test Drive" program that encourages current iPhone users to pay US$1 to test its Galaxy Note 5 or Galaxy S6 Edge+ for one month.