My conversation with Mathias Bahnmueller started as pretty much all my phone interviews do. “Can you hear me?” he asked, and I replied affirmatively. Then I asked him the same question. His answer was yes—he could hear me very clearly. And this was a tiny miracle.

That’s because Bahnmueller suffers from hearing loss so severe that a year ago he underwent surgery to install a cochlear implant—an electronic device in the inner ear that replaces the usual hearing mechanism. Around a million patients have undergone this increasingly mainstream form of treatment, and that’s just a fraction of those who could benefit from it. (Of the 360 million people worldwide with hearing loss, about 10 percent would qualify for the surgery.) “For those who reach a point where hearing aids no longer help, this is the only solution,” says Allison Biever, an audiologist in Englewood, CO who works with implant patients. “It’s like restoring a signal in a radio station.”

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Cochlear implants bypass the usual hearing process by embedding a device in the inner ear and connecting it via electrodes to the nerve that sends audio signals to the brain. The implant gets sound from an external microphone and sound processor that usually sits behind the ear. Until now, users have had to deal with balky remote controls to adjust the settings. And dealing with smartphones has required a separate piece of equipment that vexes communication thanks to its low quality and annoying lags. But Bahnmueller, a 49-year-old executive in automotive safety, has recently been testing a new solution. The reason I was coming through so clearly is that his over-the-ear device linked to the implant was streaming directly from his iPhone—essentially putting the conversation in his head.

The system he was using came from a collaboration between Apple and Cochlear, a company that has been involved with implant technology since the treatment’s early days. The firms announced last week that the first product based on this approach, Cochlear’s Nucleus 7 sound processor, won FDA approval in June—the first time that the agency has approved such a link between cochlear implants and phones or tablets. Those using the system can not only get phone calls directly routed inside their skulls, but also stream music, podcasts, audio books, movie soundtracks, and even Siri—all straight to the implant.

“While our devices have been built to support hearing aids for years, we found that the experience of people trying to make a phone call was not always a good one,” says Sarah Herrlinger, Apple’s director of global accessibility policy. “So we brought together a lot of people in different areas around the company to start investigating ways to make the process easier.” As she indicates, Apple’s accessibility team has been working for several years to support conventional hearing aids—an initiative whose results are made apparent by not only the dozens of hearing-related products in the App Store, but also a Hearing Aid Mode built into the iOS settings. It connects with hearing aids whose manufacturers have adopted the free Apple protocols, earning them a “Made for iPhone” approval. Apple also has developed a feature called Live Listen that lets hearing aid users employ the iPhone as a microphone—which comes in handy at meetings and restaurants.

Taking on the task of making iPhones with cochlear implants was harder. “Our goal was to get rid of all those extra things that need batteries and can get in the way, so when a phone call comes in you just hit the button to answer it and that sound is streaming into your hearing aids,” says Herrlinger. It wasn’t an easy process, because this solution required pushing the Bluetooth wireless technology farther than usual. To do this, Apple’s accessibility team—which spans the company’s entire product line—had to tap the talents of its engineering staff in wireless, battery consumption, and UI design. “It’s a different type of device, so we had to do more iteration,” says Eric Seymour, Apple director of accessibility engineering.