I recently purchased ArrowChat, they have a contract with Agora,Vonage/Tokbox on their business package...which is their most expensive package, they have 2 more packages starter & premium, as of right now i purchased the premium. I temporally paused all projects due to other issues, interesting what you mentioned above. I was trying to see how Agora works via mobile but have not had the extra time to investigate deeper. Thank you for sharing, Agora looks promising!