Download the Library Files ( A zip folder )
Paste these two files GSMLibraryTEP.IDX and GSMLibraryTEP.LIB in to Library folder
If you are using Proteus 8 then Library folder will be within the data Folder (Proteus 8 ProfessionalDataLIBRARY ) OR ProgramData (C:ProgramDataLabcenter ElectronicsProteus 8 ProfessionalLIBRARY)
Now open Proteus software (restart it if its already open) and search for GSM
Function of all these three GSM modules are same but different in color.
It,s time to test our GSM module in proteus software, double click on it and a new window will appear as shown in below figure and add the GSMLibraryTEP.hex file in it.