I bought an unlocked S8 in the UK last year, had a SIM in it for a month and then moved to Australia. Haven't used the wifi calling feature as I simply havent needed to.
I've come back home, was recommended iD for the cheap sim only deals and good coverage. However, I live in the middle of a national park and no one gets service here. My neighbour (by which I mean the person across the valley) uses iD and has wifi calling etc so I thought that would be ideal. However, having gone through and made sure everything was enabled, I can't get my phone to work, it just tells me theres no mobile network.
A little search has shown that it is a common issue with unlocked phones, but not for every carrier. So the fault therefore appears to lay with iD. Please please tell me there is a way to rectify this so I dont have to go through the rigamarole of getting another sim!!