Android - Chat real time with or without internet

Need professional work with good layout. Short Description : Any one who download our app can ask for any query with our online support or help from backend on real time chat system. If his internet works then using internet chat system otherwise using SMS mobile network and same replied from our team using our SMS (API or SMS mobile credits) Full descriptions : 1) SPlash page with logo 2) Welcome screen to login ( Name and Mobile No.) it will be always on 3) Real time chat with our backend team (using internet or SMS) 4) Backend Control for a team a) All user lists b) Chat System like image i have shown c) Push notification d) Member of admin backend This is first phase. Please check drawn image to understand.