No, hisses and buzzes aren't unique to iPhone 7 and aren't a problem
First, it was iPhone 7 Home buttons and capacitive gloves, now it's iPhone 7 making a "hiss" or "buzz" sound. Every year, the tidal wave that is iPhone launch attention sweeps up all sorts of "gates" in its wake, and it can be difficult and confusing to sort the real from the imagined.
We've now spent almost a day testing both iPhone 7 and iPhone 7 Plus, as well as the last two generations of iPhone, all recent iPads, recent Macs, peripherals like routers, and other electronic devices. And here's the deal:
They all make the same noises, and all to differing degrees. I initially thought iPhone 7 Plus might be louder, but after putting a series of devices through high-intensity CPU/GPU activity, which pulls much more power than normal daily use, they all sounded roughly the same. That includes the MacBook Pro I'm typing this on right now.
It also makes sense, given the people who noticed the noise did so while their new iPhones were restoring, which migrates libraries, re-indexes data, and otherwise puts the system through heavy load.
Since many people have now reported hearing the same sound from other devices across a wide range consumer electronics and brands, and hardware engineers around the internet have commented and tweeted explaining what the sound is and why it's not only normal but expected, it seems highly likely nothing out of the ordinary is going on. (I'd say "almost certainly", but I try not to mistake my writing for an engineering degree!)
Perhaps there's something about the new iPhones that makes the sound louder and more noticeable, or perhaps it's because everyone is hyper-vigilant following the Galaxy Note 7 recall.
Regardless, there doesn't seem to be anything to be concerned about, not with the processors, the batteries, nor the radios. So go back to setting up your new iPhones, and enjoy!
Updated to reflect additional testing and information.
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.
I used to have a Dell Latitude that was super loud that way... Same for the out of the box Nexus 5 charger... Could not use that one in the bedroom because the buzzing would drive me mad.
I've never heard bussing with that volume on any mobile device since coil whine on a Treo 750.
At least call this out as something Apple needs to address. Regardless of whether or not it affects operation, someone paying over $700 for their phone should not be subjected to this. Posted via the iMore App for Android
Regardless, thanks Apple Bot for the insight! Posted via the iMore App for Android
Was listening podcast on a Bluetooth headphone, had the hiss sound, I thought it might be the app. Quit the app, still happening. Then I thought might be the headphone, used the wired lightening headphone, still happening. Did some search found that could be the overload issue, force quit all the apps, still happening.
Had to reboot the phone, then the issue went away.