GSM Tapping

Hello,
I’m writing because my flatmate got a LimeSDR mini for present.
Can he listen to my phone calls now?
I have seen https://www.evilsocket.net/2016/03/31/how-to-build-your-own-rogue-gsm-bts-for-fun-and-profit/ it was pretty scary, but it uses a different hardware.
Thank you