How to make calling system like whatsapp in kodular

How can i make a calling system like whatsapp call in kodular please help me

What have you tried so far?

I dont have any concept if you have can you tell me please

Search google to see what features need to be in a whatsapp app, search the the forum, try something for yourself. If you get stuck show us what you tried and maybe someone will help.

Can anyone give an idea about that

Did you follow the advice to

Yeah but didnt get any concept

Then you didn’t search correctly. Google is full of search results for how to make apps like whatsapp, including a calling system.