Servers for Android applications, when are they needed? For example, a server is needed for an application that was created only for the Internet correspondence of 100-1000 people?

Question

Android

Or will the program do everything? If you need a server, how to do it?

Answer 1

Your example will need a server.
In almost all cases, a server is needed to transfer data from one android to another.
In order for you to have a server, you need to contact a specialist who will configure you according
to your requirements