Hello Raymond,
I have a Lumia 1520 from Latin America (generic - no Country assigned). I am using it here in the United States and my Cortana is just fine.
There are a combination of settings needed for Cortana to work. In the US: Region needs to be set to United States, Speech set to English (United States) and Language set to English (United States). In the case of the Language setting it needs to be at the TOP of the list of Language packs you have downloaded.
If you need to alter any settings to comply, then you also have to follow this with a reboot. Do not do a Soft Reset!!! The phone will forget it was making the change. Power Down and then Power Up again. Cortana should now appear in your Apps list.
http://answers.microsoft.com/en-us/m...e-3fde582aecd4