The past few cycles, all iPhone shipments have been managed by UPS. But I'm almost certain Apple tapped FedEx for iPhone shipments in the past. Maybe even that '07 version that started all of this madness. I also want say there was a time when Apple leveraged both UPS and FedEx for iPhone shipments to "meet demand" as I recall some pretty intense debate about which carrier was better. This weird, pro-UPS v Pro-FedEx alliances formed and each side claimed their iPhones were better because of the carrier assignment - which was entertaining.
That said, I could be confabulating the details above. What I'm most certain about is that FedEx has shipped me at least one iPhone in the past. I could be wrong. 🤪