(Re-sendung this after subscribing. Apologies if it ends up being sent twice. By the way, is there a way to only receive answers to one's own messages?)
Hello,
I'm afraid that I am very naive in radio matters (I hope to gradually change that - reading recommendations welcome!), though I have reasonable understanding of computer hardware driving from the computer side, and am working on learning electonics (that is, working through Scherz and Monk's Practical Electronics). I was wondering whether it is possible, using existing free software and a USDR (presumably in combination with a SIM card interface, and an RPi or whatever) to recreate a GSM/UMTS handset. And if not, how close one can currently get.