Yes it OnDo you have location services on? Cortana requires location services.
Every setting in my lumia 1520 is US English but I still don't see my CortanaMake sure English (US) is at the top of your languages, or the only language. Try changing Speech to English (US) also.
Thank you, everything is fineSo is everything alright now?
Also I think I read somewhere that even your keyboard settings play a minor role and I believe I've read that it's recommended to have installed only US English as only keyboard language. Never thought that was important and I'm not sure whether or not it is, just try it and let us know if you still don't have Cortana, but according to your last comment it looks like your problem already solved.