OpenWrt + "Raspberrypi 3 B+" + Thetering USB as WAN (iOS-Android)

Hi to all, I would like to make this configuration that I described in the title.
I would like to use this configuration to use the raspberry as an emergency access point.
In this way it would be enough to connect an iphone or an android and activate the thetering usb to have the connection in the whole network!

I tried this guide:

-I installed all the packages correctly
-I executed usbmuxd
-I connected iPhone and I have this log

[ 1664.176782] usb 1-1.2: new high-speed USB device number 10 using dwc_otg
[ 1664.318766] usb 1-1.2: New USB device found, idVendor=05ac, idProduct=12a8
[ 1664.330769] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1664.343252] usb 1-1.2: Product: iPhone
[ 1664.352036] usb 1-1.2: Manufacturer: Apple Inc.
[ 1664.361554] usb 1-1.2: SerialNumber: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx <---I hid it

-I activated hotspot (only bluetooth and usb)
-I ran

uci set network.TetheringWAN=interface
uci set network.TetheringWAN.proto='dhcp'
uci set network.TetheringWAN.ifname='usb0'
uci set firewall.@zone[1].network='wan wan6 TetheringWAN'

ifup TetheringWAN

-After i activate wireless AP (default OpenWrt)

But in interfaces i see that

How i can reach what i want? Thank a lot!

On Android you have to go to the phone's Settings -- Network menu and turn on USB tethering after connecting the USB cable. Then rndis should create a usb0 interface (or sometimes a new ethX interface) and you can use it.

I think iPhone would be similar.

Also some phone companies don't allow tethering on some plans, so the settings menu option may not be present or usable.

The problem is openwrt not android or iOS. I thought it was clear