Android Bulk SMS Application

I need to develop a bulk SMS application which is capable for sending 100s of SMS. SMS will be composed in web server and passed to android app, via GCM in json format. Once SMS received, it is to be stored in local db and processed, Once all SMS sent, the send report to be submitted back to the server. All communication between web server and the app are in json format, and protocol details will be shared for the winner.\r\n\r\nRefer the attached image and each view is explained as below:\r\n1 - Shows the splash screen, register GCM, pass the Register ID,IMEI and a random 6 digit number to my web [login to view URL] 6 digit number to be saved locally.\r\n2 - Shows menu option needed.\r\n3 - The getting started instruction.\r\n4 - Any SMS message received to be stored in db, processed one request at a time. Accept new SMS requests while processing others. A button with confirmation to clear processed SMS.\r\n5 - Showing the IMEI number and 6 digit code. Facility for changing the 6 digit number when needed and updates to be sent to web portal.\r\n\r\nKnowledge/experience of Google Cloud Messaging & Bulk SMS is important.