This must be the cheapest GSM module that you can buy. With a little bit of attention to the power supply, it works well.
In this video I connect it via USB to a PC and experiment with sending and receiving SMS messages.
Hardware manual: http://cyntech.co.uk/downloads/neoway-m590-hardware-design-manual-v1.pdf
AT command set:
https://g1fef.co.uk/wp-content/uploads/2019/11/Neoway_M590_AT_Command_Sets_V3.0.pdf
See also, the earlier videos on the SIM800 and SIM900 GSM modules:
https://youtu.be/8rqfPc8aRGc
https://youtu.be/KVI7BhXEJ3o
and my Github site for accompanying code:
https://github.com/magiccow/sim900