Cortana is your personal assistant on Windows Phone 8.1. She's there to make things easier for you and make sure you're always up to date on the things that matter most to you. Unfortunately, Cortana is only available on phones with Windows Phone 8.1, and only in some countries or regions. You can enable it in any country, see the below steps.
How-To: Enable Cortana on Windows Phone 8.1 in any country
How-To: Enable Cortana on Windows Phone 8.1 in any country
❶ Go to Settingskeyboard, change the language to English (United States)
❷ Go to Settingslanguage, set the language to English (United States)
❸ Go to Settingsregion, change Country/Region to United States, set Regional Format to English (United States)
❹ Restart the phone.