In case of SDR you should not forget to get a license to transmit in GSM spectrum: Legalities and options The GSM spectrum is very expensive private property.

In case of SDR you should not forget to get a license to transmit in GSM spectrum: Legalities and options The GSM spectrum is very expensive private property. You may not transmit (or even receive) in GSM bands without permission. In the UK, it is an offence under the Wireless Telegraphy Act to transmit on licensed bands without permission and furthermore intercepting GSM without a warrant is an offence under the Regulation of Investigatory Powers Act.You should apply for a licence (example from OFCOM below) before commencing GSM testing and will also need a faraday cage to suppress radiation. (For these reasons, GSM interfaces get less scrutiny than TCP/IP for example). https://www.contextis.com/blog/binary-sms-the-old-backdoor-to-your-new-thing https://www.contextis.com/blog/binary-sms-the-old-backdoor-t...