Depends on your definition of chipsets, but iPhones do use a significant amount of Qualcomm chips. One source of many: https://www.ifixit.com/Teardown/iPhone+6

Depends on your definition of chipsets, but iPhones do use a significant amount of Qualcomm chips. One source of many: https://www.ifixit.com/Teardown/iPhone+6s+Teardown/48170 https://www.ifixit.com/Teardown/iPhone+6s+Teardown/48170