But there are free conversation clubs and language exchange?
Yes, and it's a good way to practice the language, but not to learn it. In the mentioned variants, no one pays 100% of their attention to you, they poorly control your mistakes and certainly do not offer a personal selection of exercises.
Can I communicate with AI as a person on the phone?
While we have only the chat function available, we are working on the ability to call and communicate as with a real person. We plan to release it in 2022.