how to build an mobile application like massenger and whatsup? how can start?

Question

how can do it? I have not computer,
I have only mobile

Answer 1

Hey Piyu, I would suggest that you of course read about Instant Messaging libraries on your favorite programming language, and try building something really small, an app with just 2 endpoints in the LAN.

You would encounter the handshake process which establishes the session between those 2 endpoints, and from there the process of sending data while listening, which does not really happen as the end user thinks, but that's where the libraries are useful with their ready to use methods.

If you want to create a mobile app, I would suggest you start with a desktop app, which would give you the entire process, and from there it should be straightforward to build your mobile app focusing on the session establishment as the only thing that changes greatly.