To access voicemail, simply dial 171 where you will be advised if you have any voicemails and be promted to listen.

To access voicemail while roaming, you can dial your phone number (including your home country international code) and add a 5 between the prefix and the rest of your mobile number (e.g. +3538551234567) Once you hear your greeting, press the hash key and enter your 4 digit pin.