Which router do you use?
Can you explain what iPhone tether means?
Deciding if I want to keep an AX86S or AX86U.. both were purchased at a good price.
IPhone tether basically means you can plug your iPhone to USB and broadcast Phone's Hotspot data to entire home/location. Worked for Android, but iPhone was never supported.
Synology routers have supported iPhone tether, but It's nice to see it come to ASUS platforms. Hope same is true for 490X based routers..