I'm not quite sure what you mean when you say 'can't RECEIVE voicemail'. Do you mean that:
- no one can leave VM for you?
- you can't find where to get VM that people have left for you?
- other?
You'd normally find VM in the Dialer application (fourth tab from the left). If that tab isn't there at all you may want to consider a Factory Reset. For other issues you may want to contact your carrier.