I prefer the 4 Port ONT, at least with that if Port1 dies the config to be moved to one of the other ports.
I don't believe you can do that - at least, not without re-provisioning by your ISP - since the service is bound to an individual port.
I suspect the reason the 4-port ONTs were dropped was to save a few pennies, given that the vast majority of users took only a single data service. Still, it would have been nice when changing ISP to have the old ISP on one port and the new ISP on another.
I am not too sure if you was referring to me just swapping the ports, I was referring to BT changing the port to use and then asking me to move the WAN cable to that port.
I say this due to a few months back we lost internet yet our phone via FVA worked fine, spoke to BT's FTTP Team who went through loads of tests and could see our ONT connected.
They then asked if it was plugged in Port 1 which it was when I checked, I was asked if I had any spare cables which I did and still nothing.
I was then put on hold for about 5 or so mins while they was checking something, so I played with the WAN cable by plugging it in the other ports and it was working on port 3, when they came back I told them its connecting up when its in port 3 and they could confirm it connected and confirmed it was on port 3, they sounded confused why it was using port 3.
I was then told to plug it back in port 1 and then wait.
Was doing stuff around the home and when I checked later on I could see it was working.
Now what caused this I have no clue due to I was never told.
Maybe they requested for it to be reset back to port 1, who knows, but its been fine since.
But yeah I think it was to save on the build cost and like you said not many people would order more than one FTTP connection by different ISP's.