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All big Value Bundles come with inclusive data.
However, until 4th February Vodafone have a Big Value winter sale where you will be able to get 6 packs for the price of 3 and that should pretty well take care of all your calls and text needs for the next six months with up to a £60.00 saving.
If after 6 months you don't want to change of opt out of the pack this can easily be done through the My Vodafone application on your phone but as you only have a simple phone this can also be done through the 2345 PAYG calling menu,
Please see this link, it has all the information and hope it will help: PAYG Big Value