https://blog.strcpy.info/2016/04/21/building-a-portable-gsm-bts-using-bladerf-raspberry-and-yatebts-the-definitive-guide/ Building a portable GSM BTS using the Nuand bladeRF, Raspberry Pi and YateBTS (The Definitive and Step by Step Guide) I was always amazed when I read articles published by some hackers related to GSM technology. H owever , playing with GSM technologies was not cheap until the arrival of Software Defined Radios (SDRs), besides not being something easy to be implemented. A fter reading various articles related to GSM BTS, I noticed that there were a lot of inconsistent and or incomplete information related to the topic. From this, I decided to write this article, detailing and describing step by step the building process of a portable and operational GSM BTS. Before starting with the “hands on”, I would like to thank all the pioneering Hackers and Researchers who started the studies related to previously closed GSM technology. In particul