I have MikroTik hAP ac² .
I need to use my iPhone as a USB LTE modem on Mikrotik
How can I implement this? I really need this?
iPhone presents as a USB device
You can use a wifi interface in station bridge mode to connect to the iPhone ap.
While true you can connect via iPhone Wi-Fi, but OP is connected via USB.
You’ll have to file a feature request. While iPhone will show up as USB, iPhone does not support MBIM protocol that Mikrotik uses.
On Linux, it takes extra drivers, since some Apple-specific code is need to setup the data session. Without drivers, RouterOS will NOT be able to connect to iPhone for data… even if it shows up as generic USB device.
ArchLinux documents the libaries/userland stuff, see https://wiki.archlinux.org/title/IPhone_tethering & Mikrotik has none of those.
lte - added USB tethering support using iOS devices on 7.22
finally
What version ? 
Has just been released, 7.22 just his morning.
I’m trying to use it without success… I wasn’t been able to find any documentation
Today I tested it on an iPhone with personal hotspot enabled using 7.22 stable on the hAP AX S, and it worked smoothly without any issues.
Have you done something special?
Nothing special, I just plugged it in and it worked. I tested it both with the default configuration and also after resetting with no-default-configuration, and it worked fine in both cases. With Personal Hotspot enabled on the iPhone, once you connect it to the hAP AX S, the phone shows a “Trust This Computer” prompt. After accepting it, a dynamic LTE interface appears on the interfaces menu, and the interface gets an IP address automatically via DHCP client.