Zello is quite big here in the Southern side of Africa.
Our communities have channels we monitor with all the SHTF this side.
every person who joins needs to give admins certain details to be verified before they are just let in.
It helped us weed out some unwanted ears over the last while.
Useful when you are covering entire communities.
Yes it uses a lot of data and ours is expensive but for the bigger part during riots or emergencies it has proven its weight in gold this side.
Definite green light when used right.
Hope all is well with everyone across the big blue.
Kind regards
RM