Use a tool like WinRAR or 7-Zip to extract the files. You should see at least two files: GSMLibraryTEP.LIB and GSMLibraryTEP.IDX . 2. Install Files to Proteus
// Set SMS to Text Mode gsmSerial.println("AT+CMGF=1"); updateSerial();
To simulate the module, you need specific .LIB and .IDX files provided by sites like The Engineering Projects .