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Hi there. They must not have released it yet for you handset yet, I have a 635 on Vodafone and its not out for that phone yet.You probably won't get s timescale from Vodafone about when it will be available.
Cortana for the UK is only available to either those who bought phones where 8.1 was installed on the device on release or those on the developers prieview firmware
Note I do not work for voda, My advice comes from experience and my opinions are my own