"0" selection not retrieving voice messages

Question edited for clarity.

This phone system has two features.

Answerphone system which records messages to the unit.
and
Voice Mail System which is an extended (often paid) service from your telephone provider.

Sometimes a glitch at the Telcom will remove your Voice Mail. You will need to phone their customer service number and ask why they stopped the service you previously enjoyed? They will be able to put it back in place.

Page 32 refers

https://cdn-media.vtechphones.com/products/CS/CS6929/CS6929-X_WEBCIB_V3_20160224.pdf

Retrieve voicemail from telephone service Voicemail is a feature available from most telephone service providers. It may be included with your telephone service, or may be optional. Fees may apply.

Retrieve voicemail When you received a voicemail, the handset displays New voicemail and . To retrieve, you typically dial an access number provided by your telephone service provider, and then enter a security code. Contact your telephone service provider for instructions on how to configure the voicemail settings and listen to messages. NOTE After you have listened to all new voicemail messages, the indicators on the handset turn off automatically.

Set your voicemail number You can save your access number on each handset for easy access to your voicemail. After you saved the voicemail number, you can press and hold to retrieve voicemail. Press MENU when the handset is not in use. Press or to choose Settings, and then press SELECT. Press or to choose Voicemail #, and then press SELECT. Use the dialing keys to enter the voicemail number (up to 30 digits). Press SELECT to save. You hear a confirmation tone. • 1. 2. 3. 4. 5. 33

Turn off the new voicemail indicators If you have retrieved your voicemail while away from home, and the handset still displays the new voicemail indicators, use this feature to turn off the indicators. NOTE This feature turns off the indicators only, it does not delete your voicemail messages. Press MENU when the handset is not in use. Press or to choose Settings, and then press SELECT. Press or to choose Clr voicemail, and then press SELECT. You hear a confirmation tone.

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Hi, unfortunately from your phone there is no way to retrieve a voicemail that you have already sent.
If you want to check your voicemail setups on your phone you can follow the steps that are in this troubleshooter Setup Voicemail for my phone
Best Regards!

1. Select Voice Messages & Call History from the Contacts menu in the Messenger window.
2. Right-click a contact in the Messenger List and select Voice Messages & Call History from the menu.
3. The Voice Messages & Call History window opens. Unless you've opened the window with a specific contact selected, the window displays your voice messages (if you have any) or your entire call history

The display on a Nortel set will say "message for you" if there's a message in your mailbox. To access your voicemail you can press your open voicemail key if its programmed or press feature 981.If you wish to retrieve your messages remotely, call your office, when the autoattendant answers the call press ** followed by your extension number, your password then # (ex. **2231234#).

Assuming that you have voicemail oh your service plan with this phone, there should be a voicemail number that you call to get your messages, Many phones assigen the number 1 for this function, but if in doubt, ask your service provider.

Press *7 when voice mail answers and follow prompts.

Every Cellular company provides a specific number for voice mails. You can call to your Customer Care center to ask about the voice mail number they will provide you the correct number and remember your Cellular company provide voice mail facility to you. You have to open the facility first.

Let me know If I can help you further regards this problem.

<<This is straight from TracFone support for setting up voicemail on the Motorola C139....enjoy>>
Thank you for your interest in TracFone Wireless. We are responding to
your recent inquiry.

TracFone Wireless would like to take this opportunity to apologize for
any inconvenience this issue may have caused you.
Your voicemail box has been reset. To set up and retrieve voicemail from
your TracFone:

Press the MENU key,
Scroll to MESSAGE and press SELECT,
Then scroll to VOICEMAIL and press the MENU key,
Next scroll to VOICEMAIL SETUP and press SELECT,
The VOICEMAIL Access Number should be: +17044089979 and press the OK
key (if there is no + sign, please press and hold the 0 key until it
comes up).
If the numbers there are different, press and hold the key below the
word CLEAR or DELETE until all the numbers disappear from the screen.
Then enter the number 17044089979 and press OK.
After programming the Voicemail Access Number on handset, please turn
the phone off and back on.
Then, press and hold the 1 key to auto-dial the VOICEMAIL box to record
greeting and complete setup.

Your temporary password can be 0000, 1111, 9999, the last 4 digits of
your wireless number, or another 4-digit number easy to remember.
All calls made to your voicemail from your TracFone will deduct airtime
units. To avoid being deducted airtime, it is recommended that you
contact your voicemail from a land line phone, by dialing your ten-digit
mobile number. To retrieve voicemail messages from a landline phone,
please follow the instructions below:

1. From your landline phone, dial your TracFone Number.
2. When you hear the greeting, press the star (*) key. If the star key
does not interrupt the greeting, press the (#) key.
3. Enter your password and follow the retrieval instructions.

Please note, if this procedure does not resolve this issue, we would
need to talk with you directly for further assistance.
Should you have any further questions or concerns, please contact one of
our customer care representatives at 1-800-867-7183. For your
convenience, our representatives are available Monday-Saturday from 8:00
AM to 9:45 PM EST, and on Sunday from 8:00 AM to 6:45 PM EST.

Thank you for being a TracFone Wireless customer. We appreciate your
business.

Sincerely,

TracFone Wireless

Are you not able to retrieve new voicemails or only saved voicemails? Occasionally your carrier may delete old saved voicemails to make room for new ones.

If you want to save all old voicemails on your computer forever, you can sign up for a service like youmail.com

Motorola L6 Keypad Layout

1. From the stand by screen, press the Menu key.
   
   
2. Scroll to and select Messages.
   
   
3. Scroll to "Voicemail" and press the Menu key.
   
   
4. Scroll to and select Voicemail setup.
   
   
5. Select Voicemail No.
   
   
6. View or edit the Mailbox Retrieval number, then select OK.
   Note: If the Voice Mail Retrieval number is unknown, contact Customer Care for the users local number or to have programming sent to the device.