This is one of the semiconductor types. This part name is SIM800L.
This product has Hardware Design functions.
Manufacturers of product is SIM Com.
Image and pinout :
SIM800L PDF Datasheet
Some of the text files within the PDF file
SIM800L Hardware Design http://www.seeedstudio.com/wiki/images/4/46/SIM800L_Hardware_Design_V1.00.pdf [ … ]
Please refer to the file for details.