Nokia 5180 - Manual (Page 53)

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If you received a voice mailbox password, and if you saved it
with your voice mailbox number, follow these steps:
1 When your phone notifies you that you have a new voice
message, press Listen. Your phone dials your voice
mailbox number, and your password displays.
2 When your phone notifies you that you’re able to listen
to your messages, press Send.
Note: The method of notification depends on your service
provider. If you have any questions about voice messaging,
contact your service provider.
Calling your voice mailbox at any time
Once you have saved your voice mailbox number, you can
press and hold
to dial your voice mailbox.