Should I make a fake phone call app to be able to practise?

Should I make a fake phone call app to be able to practise? Hey, a stuttering indie mobile apps deveper here. I'm thinking to make an app that would basically imitate a real phone call. I always got really nervous when I hear the dial tone and stuck when the other side picked it up. There could also be a random voice, or if I push too hard an AI for real conversation. I think it could help get used to these situations and handle them better. Moreover, this could be a tool to practise the speech in general, not just preparing for a call. This way you can practise speech sitting in a tram full of people, walking, waiting in queue etc. What do you think? Should I make this app?