Hi. Just joined O2 (again) after spending the last few years with another carrier.
I'm on a SIM-only contract which I was attracted to by the free roaming, especially in the US.
I have an OPPO Reno2 which has given me no problems; it's the first ever phone which has been trouble free for over three years, previous phones seem to have failed after just over two years of use.
Anyway, back to the question. I don't seem to have any way of switching on 4G and Wi-Fi. In the MyO2 devices tab it only shows a SIM (which is fair I suppose).
I have checked the carrier icon and it shows 4G next to the four bars carrier signal. As such I thought "that's OK for the USA", and Wi-Fi calling should be available. However, when I checked my IMEI on the O2 website it said not compatible. I have a backup PAYG SIM with Three and that allows Wi-Fi calling so I'm a bit stumped.
Now, and this is the nub of the question, is the IMEI saying the handset is incompatible because of wireless frequencies, or is it the lack of an O2 ROM.
