This is a modified version of the grgsm_livemon to make it work with hackrf, for some reason they took it out of recent distractions including RF focused linux distros like DragonOS. That was foolish, so I brought I would bring back the joy. Open in GNU Radio Companion, build, and play.
Example usage after building: python grgsm_livemon.py -a -g 30 -f [freq]M
Get it HERE