A sim module sends sms to the Phone , the App recognizes that specific sms (from sim number on module). It then takes the data on the message and organizes the info into correct categories, this data is stored in the App and can be accessed at any time to be viewed. The App must also be able to print the reports it holds. There are 2 main functions namely History and Real Time. In History one is able to access all the relevant info received over time. In Real Time a sms is sent from the phone to the sim module (with a simple command) the module responds by sending back the requested info.