Comment by Tha_14

Unfortunately we don't have any good clients for android that do videocalls properly(not even qtox on PC works that great). aTox is the only android client that was starting to get the proper features but the maintainer is busy with IRL stuff. You're right though, text and file transfers work pretty well and we are writing replacements for the existing code to make everything more reliable(and faster in the case of file transfers).