When you receive a voicemail message, your phone displays 1 New Message and a new voicemail indicator. Some networks only indicate when you have messages, whether or not they are new. If users delete all voicemail messages, the voicemail indicator will disappear.
To listen to your voicemail message:
Find it: Press M > Messages > Voicemail
Your phone calls the voicemail phone number you stored.
If you do not have a voicemail number stored, the phone guides you through the process of storing a number.
If you don't know your voicemail number, contact your service provider.