Roaming in Turkey

I’m travelling to Turkey and looking at the Id mobile website looking at purchasing a ‘roam beyond’ add on  (https://www.idmobile.co.uk/help-and-advice/add-ons#content-roam) to use my phone whilst there. However these only cover data and there is no information concerning buying add ons to cover calls or texts. I would expect an add on to be able to be purchased to enable me to use my phone as if at home and the lack of clarity is unhelpful, as the only information on call and text in Turkey is; https://www.idmobile.co.uk/help-and-advice/international-and-roaming-charges and surely Id cannot seriously expect you to pay these charges? Where is the option to be able to by an add on that covers calls, texts and data?