Thanks for answering.
I could successfully connect to the server using telnet via Tor.
So it seems that the exchange server is filtered by my ISP (have no idea about the reason) or my IP address might not have the permission of connecting to the server (because of the US sanctions against my country)!
Hence I should use a proxy in worldmobilecoin app for connecting to the exchange server.
I can use proxychains4 app for tunneling worldmobilecoinapp but it makes the app so slow.
Is there any way to set a proxy for worldmobilecoin app?
I was also think about this. The only solution i can think right now is install the websocket server in a few different places (US,Europe,Asia). But i cant afford right now with my limited fund for this project. The exchange server was prepared to support unlimited websocket server and every websocket server can handle about 200k user pertime. The main server for all user data is run behind router, so all user data should be safe.
The other ways, maybe wait for web browser base release.