Voicemail can be accessed by various means. 

Via Phone 

Dial 605 "send" from your handset, after a few seconds your handset will ring, answer and listen to your messages, the regular rate to a receive a call in the country you are visitng will apply, see rate calculator.

Via WiFi Calling

Listen to your Voicemail for FREE; via WiFi Phone App. Dial 605 "send" (direct no Call-Back).

Via Mobi Passport Account

Your online acccount includes a free web-based visual voicemail interface, so that you can check your voicemail from any computer with Internet connection. To access voicemail via your online account:
    1. Login into “My Account”, using your registered username and password.
    2. Select a Sim Account Number and Click Get Account Details
    3. Click on “Voice Mails”.
    4. Listen to your “Voice Mails”.