This is one of the semiconductor types. This part name is SIM808.
This product has Hardware Design functions.
Manufacturers of product is SIM Com.
Image and pinout :
SIM808 PDF Datasheet
Some of the text files within the PDF file
SIM808 Hardware Design https://cdn-shop.adafruit.com/product-files/2637/SIM808_Hardware+Design_V1.02.pdf [ … ]
Please refer to the file for details.