https://www.fastcompany.com/3063656/the-real-reasons-the-iphone-7-ended-up-with-an-intel-chip-inside
"Today Intel has its own growing fabrication business that might one day bake modem chips that go inside iPhones. Intel’s next generation modem, the 7460, will very likely be fabricated at Intel using the company’s 14nm process. That’s likely to help create a smaller and more efficient modem for the iPhone"