I wonder what some of the regional quirks are, instances where the implementation strays from the standard, but if you don’t do it in quirks mode, you can’t con

I wonder what some of the regional quirks are, instances where the implementation strays from the standard, but if you don’t do it in quirks mode, you can’t connect to the cellular connection or calls will not go through etc. A sort of woops, non-strict YAML moment, but in telecommunications.