[Q] Marshmallow Visual Voicemail settings - manual entry?

With 6.0 making the rounds now with OTA's coming through I'm interested to know if it's possible to turn on Visual Voicemail even though carriers would (likely) not have enabled it yet. In my situation, my carrier supports Visual Voicemail for iPhone users but android is not yet supported. I'm wondering if there's a way that anyone knows of, to manually enter the carrier settings for it to be used.

For reference, I'm on Vodafone in Australia, and a random dev has made an app for visual voicemail which works on Android but its nice to have it natively.

[Q]How to add a new entry in system settings?

hi guys, I would like to integrate AppsOps app which is very nice in my rom as per users suggestion.

the app is working fine now, but I need to run it via the drawer, while I would like to add an entry for it in settings, to be able to access it via system settings rather than keeping it in the drawer... do you guys know how to do that? :fingers-crossed:

TIA! :o