Apple used Intel modems for many generations - the iPhone 7, X/8, XS, 11. For some generations they used Qualcomm chips in the models for CDMA regions since Intel didn't make a CDMA modem. So you could tell which chip you'd get from the iPhone model number.

Apple ditched Intel due to Intel being at least a year behind on 5G.

These modems were all LTE modems though. They've always used separate Broadcom chips for WiFi/Bluetooth.