Well what could I do about it then? Like of all the people who updated in the OnePlus 3 forums it's only me that has this issue and I don't have great phone knowledge to know how to fix it...
Mine is even worse, I use OnePlus 3 and recently upgraded the OxygenOS to 4.0. Then all of a sudden my LTE/3G/H ALL disappear. It even says "unknown carrier" in sim settings and data settings. But I could still call or text people, and I don't know i...