Micha8888 , via OnePlus Nord , Aug 15, 2020 : This is a problem that I had my last vacation. When I am in other countries and I try to use roaming it shows that I have connection but the 4g logo doesn't appear. I've checked the APN but that is fine and the roaming is also powered on. It works fine on my other phone (s9) when I change sim. As soon that I crossed the border of my home country the 4g worked fine again. I personally think that it is a problem with the roaming function on the OnePlus Nord because if I try to browser with the Google app it says I need to power my roaming on. If I touch the button I can see that the roaming is already powered on. Hope it gets fixed in a future update because this is really frustrating!