I would like to change the tariff of my Vodafone prepaid card to "CallYa Start". Unfortunately I can't find the option in the MyVodafone app or add the contract to "MyVodafone :: To MyVodafone". whether the "CallYa Start" tariff is still available an...

I would like to change the tariff of my Vodafone prepaid card to the "CallYa Start". Unfortunately,  I cannot find the option in the app MeinVodafone or add the contract to  "MeinVodafone :: Zu MeinVodafone". whether is the "CallYa Start" tariff stil...