The sound, described by some as a hiss or screech, has drawn comparisons to how a computer's CPU / fan can begin to whirr when pushed to the edge. It's as yet undetermined whether this is an outright defect with some models, or simply a drawback of Apple's new A10 Fusion silicon. Perhaps, although seemingly unlikely, Intel's LTE modem chips could have something to do with the mysterious noise.
Blogger and iPhone 7 Plus owner Stephen Hackett is one of a number of early adopters to have sounded off about the issue via Twitter. Having contacted AppleCare, he's been informed that the device can be swapped in-store, even though a lack of inventory makes this impossible for now. He also shared a snippet of the sounds emitted from his new phablet:
That, as you'll probably agree, is quite a loud noise. Though we're accustomed to hearing such sounds from notebooks and traditional PCs, mobile devices tend to go about their business a little more quietly. As aforementioned, it's not yet known if this is a fault, or whether the iPhone 7 / 7 Plus will simply make noises when the processor is pushed hard.
iPhone 7 / 7 Plus owners — has your device been a smidgen noisier than you expected? Let us know in the comments.