Use the WiFi analyser see which channel less use there.
Open router interface and change the channel in advance Wifi settings.

One way to check is checking router web interface.
Take note of the address range below to know whether it is public or private IP.

Any idea the difference between both?
Range?

Noted with thanks.
I remember is 10 not 100 earlier

60Mbps?

Sometimes installer got early can be fulfilled.

Have you connected to Tel port one?

You connect 2 right?

You have one number or two numbers?
Normally the secondary is optional.

No phone dailing tone? Can your phone receive calls from mobile phone.
Try to check selfcare and see.

Hello, are you using the 2 in 1 modem?
Or the separate ONU + Modem?

If 2 in 1 modem, contact hotline at 1800 1818 18 to convert to bridge mode then connect to modem LAN Port 1.

Retrieve your PPPOE credentials through the Self Care portal.

Setup your Asus router with others as profile.
Key in the PPPOE credentials then you are good to go.

Blacktubi got give explanation why the price is expensive now.

They secretly convert to v2 then increase the price.

AI answer.

The XT8 has a hardware upgrade to V2 in 2023, with a new Broadcom 1.7GHz Quad-Core CPU. The older V1 version had a 1.5GHz Quad-Core CPU. However, the amount of RAM remains the same at 512MB DDR3 memory.

Standby 5G Modem in case fibre down

Login to WiFi Router Web interface.

Normally less than 1 hour if using prelaid fibre.
If need to pull fibre cable might take longer.

Yes, you need to call CS or live chat them to convert into bridge mode.

Yes, you can.

Phone service won't be affected.