We want to bring together all the folks that are interested in building a gsm scanner/receiver.
GSM is the worlds largest mobile phone standard. GSM 2.5 is currently in use and some countries are (slowly) migrating to GSM 3 (3G, UMTS, ..).
Available GSM scanner cost a shitload of money for no good reason. Our goal is to build a GSM scanner for less than $1000.