Wrong, Qualcomm doesn't charge % of total price of iPhone. There is a cap on the price that the royalty % can charge up to. The thing is we don't know what this cap is we can only speculate based on the finance numbers. The fee charged could be totally fair, could be not.
https://www.forbes.com/sites/aaront...e-maker-of-deceiving-regulators/#599cc6711fec
"In Apple's lawsuit, the company also claimed that Qualcomm charges higher royalties whenever Apple adds new features. Qualcomm said this allegation is outright false. Because of royalty caps, Qualcomm said, licensees aren't ever paying above a certain net selling price."
That’s not FRAND.
“According to Apple’s lawsuit, Apple may pay the same royalty rates—or more—for iPhones that don’t use Qualcomm chips.”
http://fortune.com/2017/04/28/apple-iphone-royalties-qualcomm/