Hello.
I turn on the program, enter it, enter the IP address of the voice chat in the search bar, where I talk to my friends.
  At the end of the conversation, I just turn off the phone from Wi-Fi.
  The next day, I turn on Wi-Fi, and the program does not remember the last call.

  I have to enter the IP address of the chat, again, to enter it.

2. Could you make an interface for your program in Russian? This would improve the sales of your product, in Russia.
The program is not understandable, and complex, for the average person. Having a local language will greatly simplify the setup task.