It's the same cost to check your voicemail if you're in the UK or abroad. For all of our plans, the call will be part of your inclusive minutes.
If you want to check your voicemail abroad, call +44 7836 121 121 and enter your security PIN. You'll need to set up your security PIN before you leave the UK. If you don't do this, you won't be able to access your voicemail.