Lost manual,how do you get messages from another

Question edited for clarity.
Question moved to the right category.

Manual Page 40.

https://help.panasonic.ca/viewing/ALL/KX-TGF350C/OI/TGF350C_PNQX6716XA/TGF350C_PNQX6716XA.pdf

KX-TGF350 Telephones & Smart Home - Panasonic Canada

https://www.panasonic.com > support > discontinued
Explore Panasonic KX-TGF350 - Telephones & Smart Home - with answering system and 1 Handset.

TGF350C_PNQX6716XA.pdf

https://help.panasonic.ca > ALL > KX-TGF350C
PDF
Jun 19, 2015 - Model shown is KX-TGF350. Before initial use, see "Getting Started" on page 8. Thank you for purchasing a Panasonic product ...
60 pages

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The KX-TGA402N is a handset. The message is set on the answering machine. What make and model answering machine do you have connected to your phone line?

Please mention the model number of the phone so that we can guide you.
Assuming your phone is the cordless type please check this link for the manual for the 900 MHz version.

http://www2.panasonic.com/consumer-electronics/support/Phones-Fax/Telephones/900-MHz-Phones/Operating-Instructions/model.KX-TC1486B.O#ts

If this is the cellphone please check the link below;

Panasonic Phones manuals

You don't "lose" the manual, it comes on a CD. The Panasonic system probably has a TVA voice mail system and it requires you to change the Auto Attendant greeting from the message manager's mailbox. If you don't have the passwords for mailbox 998 and 999, you need to contact someone who has them and a layout of the system.

Your Panasonic technician can guide you through the process.

Carl

You can download the manual from this link.
KX-T7130

Check on the web page for panasonic .
Type in your unit number after you get to the manual area.

I downloaded the instruction manual, based on someone else's solution to a different question about the same product.

Click here for your manual

http://www.eserviceinfo.com/download.php?fileid=31261

I’m happy to assist further over the phone at https://www.6ya.com/expert/lou_afa492c634393790

As the voicemail system can be quite complex with mailbox password setting etc. I think you will need the manual to help you along at some stage, so here is the link, just click on "download"...cheers.
( it's free )

http://www2.panasonic.com/consumer-electronics/support/Phones-Fax/Telephones/2-4-GHz-Phones/model.KX-TG2000B