There are probably extensions that allow to do that, however, this is not necessary as I will show in this post. Maybe you've seen the functionality in Safari or just wondered why the close button for tabs in Firefox can't just always be there. In Safari, the close button appears when hovering over the tab itself.
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Recently, a friend's voice mail button did not work anymore. Upon calling the voice mail, an audio error message appeared saying that the voice mail is not available or cannot be reached (something like that).
Unfortunately, Apple does not want you to just change the associated voice mail phone number that is called when tapping on "Voicemail".
Fortunately, there is a shortcut:
*#5005*86# and "call it"*5005*86*<insertPhoneNumber># and replace the placeholder with your phone number, starting with the country code (1 in this case for North America).
For example, 14381234567.This approach worked on the TELUS network (using Koodo). If it doesn't work for you, revert the phone number to the one written down in step 3 and contact your provider.
Source: planken.org