How to clear the notification screen, without listening to the voice mail?
The phone is Galaxy Ace GT.
Don't you have a Clear button in the top right corner?
This is what it looks like on my HTC Desire running Android 2.3.3.
What happens if you press and hold the voice mail? Do you get a menu to clear it out?
Tapping the notification dials the voice mail inbox, right? Unless you can tap and hold it to get a context menu from where you can remove it, then I'm afraid there's not much you can do about it.
I just talked to a Samsung rep and he was not aware of a way to remove it. He said you have to pull down the notifications menu, tap it, and then close it (essentially dialing and then ending the call).
I also had a look at the manual for the Galaxy Ace (GT-S5830). There is not much said in it about this (full manual, 127 pages, not a quick guide). They pretty much just tell you what voice mail is, how to set up voice mail server and listen to voice mails.
They don't even tell you how to clear the notification bar. They seem to be expecting that the user will know this by logic. Most manufacturers of Android handsets seem to be under the impression that Android is intuitive enough that they don't need to say many words about it in the manuals. Some manufacturers have more proper manuals, thoroughly explaining every detail, while some will just have quick guides.
I'm sorry I couldn't be of any more help to you.
May I ask why these notifications about voice mail bother you so much? Are you using voice mail? If you are not using it, then there is always the option to disable it, and you won't be getting any more of those.
So here are the options you have.
How to disable voice mail on Galaxy Ace
There is also the option "Voicemail service". See if you can just disable the service that way, instead of messing with numbers. It doesn't say in the manual what options you have, so you need to see for yourself.
You can always continue using your voice mail. It's just that you won't be getting these annoying messages every time you get a voice mail. All you have to do in the future is just call the number for your voice mail inbox. You can just save that as a new contact and call it to check for new voice mails.
If your device is running Android 4.3 (Jelly Bean) or higher, this app seems to be able to clear them.