Please note that as of my last knowledge update in September 2021, 2G networks were gradually being phased out in some regions in favor of newer technologies like 3G, 4G, and 5G.
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Additionally, technology evolves rapidly, so there may have been developments or changes in the GSM module landscape since my last update.1
References
1Swathi K, Pratyusha PS, Kalyani D, Madhavi U. Water Quality Monitoring In SPMVV By IOT Tools. International Journal of Pharmaceutical Sciences. 2(4):178-191. doi:10.5281/zenodo.10913301