Hello bncsm
Sorry to hear of the issues access your voicemail whilst in Hungary, we appreciate you taking the time to raise this via the forums and welcome to the community.
I can see from your account you have been able to speak to a member of the team today, was everything covered during this call?
To pick up your messages, access your voicemail, press the # key, and enter your voicemail PIN (which you’ll have set up at home). More information on roaming can be found here
Thanks
Rob