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Your tariff will not reduce, it continues on a month by month basis at the same price as when you were under contract. Look at sim only plans if you wish to reduce costs:
Apologies for the delay in responding, I can confirm that cookie20 is correct, when your contract expires, you will remain on the same package plan and pay the same monthly payment on a rolling month to month basis. If you would like to change your package plan at the end of your agreement, this can be requested through My Vodafone or alternatively, if you get in touch with our loyalty team on free phone 1800995522, my colleagues can run through your available options with you directly over the phone.
If you require any further assistance, please get in touch.