Lenovo s856 3g/LTE phone i am on vodafone uk and can not get 4g/LTE working

Hi I Have a Lenovo s856 3g/LTE phone and i am on vodafone uk contract, and can not get 4g/LTE working, 3g is working well, could it be the settings as I have never had 4g working
can anyone help me on this
Thanks Dave

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