Wont tell when I have a voicemail - LG enV VX9900 Cellular Phone

You need to contact your telephone company for instructions on setting up and using their voicemail system. The Uniden D1660 doesn't record voicemail, though it can tell you when you have voicemail waiting.
You may download the D1660 manual here.

I'm not familiar with Monarch Systems. Is Monarch Systems your line provider? If it's a Partner voicemail it will tell you which kind it is when you press your open voicemail key.

are u dialing ur voicemail by using direct dialing icon?
If so, u need to contact ur service provider and get the voicemail number , put that number in again. Enjoy direct dialing.

Call your voice mail by calling your cell number on your phone if its the first time your service provider will tell that you need to set up your voicemail but if not when you call your first mail its telling you for mail box options press 3 or voicemail options press 4

The solution is to take your sim card out of the phone, insert another sim card and switch on. After a few minutes remove this sim card and re-insert your original sim card. The voicemail symbol will now be removed.

Call your service provider and they can reset your passcode for you! :) Voila! That or try the last 4 or 7 digits of your phone number.

Voicemail is part of your Service Plan. Contact your service Provider and tell them to remove that feature.

Is the phone system working but the voicemail did not come back up ? Can you tell me what kind of voicemail you have, ist should be marked on the voicemail system ?

Call service provider, they can reset your voicemail options.

quick way is to delete them both and re-record