Q: Hello i need to undelete a voicemail wich i cant get back because its not a visual voicemail. I need help please!

Contact your cellular provider. Voicemails are stored on their system. I doubt they will be able to retrieve a voicemail you have deleted but some providers may have the ability to do that. Some providers do not.

You may also want to see if there is anything in the following regarding why you don't have visual voicemail. The last step in that is to contact your cellular provider so you may be able to deal with that issue at the same time. http://support.apple.com/kb/TS4430