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Download the Source code from here:
1. SIM 900A:: Arduino file
https://drive.google.com/drive/folder...
2. The Library File: Download it and extract to the Folder
C:\Program Files (x86)\Arduino\libraries
Also, There are examples given in this Folder copy them and paste into
C:\Program Files (x86)\Arduino\examples
Here is the download Link for Library:
https://drive.google.com/file/d/1u2tH...