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Apple's orders for iPhone 6s components suggest that the Cupertino company is confident its next-generation smartphones, which are expected to get their big unveilings on Wednesday, September 9, will be its most successful to date.

Supply chain partners are receiving even larger orders than those Apple placed for the iPhone 6 and iPhone 6 Plus this time last year, according to DigiTimes, despite weakening smartphone demand in emerging markets like China.

Apple's orders have been so large in recent months that its shipments "will once again squeeze sales of other vendors including Samsung Electronics, Sony Mobile Communications and LG Electronics," sources say.

Samsung has attempted to counter the new iPhones by releasing its Galaxy Note 5 earlier than other handsets in the series, and adding a Galaxy S6 edge+ to its lineup. The South Korean company has also launched the Ultimate Test Drive program, which lets iPhone owners borrow one of its latest devices for a month free of charge.

This isn't expected to have too much of an impact on demand for Apple's new devices, however, which are likely to become its fastest-selling and most successful so far as it introduces Force Touch displays, its new A9 chips, and better cameras.