Apple wanted to use Qualcomm’s 4G LTE processors in its newest iPhones, but the chipmaker wouldn’t sell to it, Apple’s operating chief testified Monday. And that’s had a ripple effect on how quickly Apple can make the shift to 5G. Qualcomm continues to provide Apple with chips for its older iPhones, including the iPhone 7 and 7 Plus, Apple COO Jeff Williams testified Monday during the US Federal Trade Commission’s trial against Qualcomm. But it won’t provide Apple with processors for the newest iPhones, designed since the two began fighting over patents, he said. And Williams believes the royalty rate Apple paid for using Qualcomm patents — $7.50 per iPhone — is too high. “We have been unable to get them to support us on new design wins past that time [when Apple filed a lawsuit against Qualcomm],” Williams said. “This has been a challenge.”