Thanks for your post, and a warm welcome to our Community Forums.
I'm sorry to hear you're having some trouble with your Voicemail when abroad. By default, and for security reasons, when you disconnect from the UK Mobile Network, your Voicemails are immediately protected.
I'm going to send you a private message so we can reissue you a Voicemail PIN. Please look out for it in the top-right, in the purple envelope.
Reece - Forum Team
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