At this stage i havnt heard of any local witnesses using these apps, the go to app used here is "what's app". And that covers everything they seem to need.
I have just installed New World Publisher (NW Publisher) to take a look. First thing it asks for is a congregation ID and pin, and if you don't know it, contact the local elders to get it. Are these IDs and pins something JW.org use? I'm sure if I was to ask a local elder for the likes of these codes, they would not know them and ask why I wanting them? If I tell them i want to install New World Publisher (NW Publisher) app, I would be quickly questioned over what that app is and what I was doing.
I have uninstalled this app, unless someone knows some ids and pins?