Hi @Jana
Welcome to the customers help customers Community of Vodafone.
If you temporarily do not use your subscription, because you are not in the Netherlands, you can pause it for a certain period of time. For € 20.84 Vodafone will cancel your subscription for a minimum of 3 to a maximum of 9 months. You do not pay any subscription costs and you can temporarily not use your mobile number. It is not possible to use your voicemail. For more information, see this page: https://www.vodafone.nl/support/abonnement-en-rekening/abonnement-tijdelijk-stopzetten.shtml (The pages shown are in Dutch!)
You could possibly switch plans, so lower them, and then continue to use them. When you return to the Netherlands you can increase it again. All services will of course remain available, but you can have your number forwarded directly to your voicemail via My Vodafone. For more information, see this page: https://www.vodafone.nl/support/abonnement-en-rekening/wijzigen.shtml (The pages shown are in Dutch!)
But you can also just keep your current subscription, if it does not cost that much per month, and then have your number forwarded directly to your voicemail via My Vodafone. Here the direct link for adjusting direct forwarding to voicemail within your My Vodafone: https://www.vodafone.nl/my/producten/toestel-en-simkaart/voicemail
Sorry if english is not quite right. I used google to translate it from Dutch to English. Hoping that this is what you are looking for and that you have all the information. If you have any questions, feel free to ask them.