Using the phone's mic isn't such a good idea, maybe? Occasionally it would ask for us to repeat or say a phrase. Then the app would evaluate whether we said it correctly. Maybe because we are not native speakers and can't hear sounds or maybe because the phone mic is imprecise, occasionally I cannot seem to pronounce something to its satisfaction. But once I couldn't close a lesson because it didn't like my pronunciation of "Tom." Until I was hoarse. Not so smart on their end to be so strict