GSM Tutorials

check: http://www.iec.org/online/tutorials/gsm/
(picture from http://www.eventhelix.com)

GSM overview


SS7


GSM Resources
Global System for Mobile Communications (Wikipedia)
GSMWorld (GSM Association)
Global System for Mobile Communication (GSM) (IEC another tutorials)
GSM Tutorials
GSM Technical Informations
GSM Tutorial from itee.uq.edu.au
Overview of the Global System for Mobile Communications by John Scourias
How A GSM Cellular Network Operates
What's Inside A Mobile Phone (Telephone hardware)
Telecom Call Flows GSM, ISUP, VoIP) by eventhelix.com
Introduction to GSM, SS7
http://lecturer.eepis-its.edu/~amang/pdf/
mobilein.com
http://www.privateline.com/
http://www.textfiles.com/magazines/PRIVATELINE/
http://www.atis.org/tg2k/


Signaling System 7 (wikipedia)
SS7 Tutorials - All about SS7!
Opensource SS7