Enables GSM/GRPS network connection using the GSM/GPRS modules. Use this library to make/receive voice calls, to send and receive SMS using Generic GSM/GPRS modules, such as u-blox SARA-U201 module.This library also allows you to connect to internet through the GPRS networks. You can either use Web Clients and Servers.
Docs say to use the inculded platformio.ini
https://github.com/khoih-prog/GSM_Generic/blob/main/platformio/platformio.ini
The file is not present.