HiByLink with an iPhone should ideally be done over WiFi as the alternative (BLE bluetooth) is very slow (because of limitations of Bluetooth Low Energy).
What were the exact steps you followed and the errors that occurred?
Bluetooth is not even an option for me. Does not show up in the List of devices and the iPhone won't connect to the R6 via bluetooth from the settings menu of either device. Over wifi, I set both devices to the same 2G wifi Point. I have R6 as Server toggled on. I have iPhone HiByLink toggled on as well. I click search devices and I see R6(131) with a wifi symbol. I click on R6 and then get a connecting message that ends up going away after 20 seconds but does not connect.