GSMArena.com - The ultimate resource for GSM handset information
https://www.gsmarena.com/
GSMArena.com - The ultimate resource for GSM handset information.
GSM - Wikipedia
https://en.wikipedia.org/wiki/GSM
The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G)...
What does GSM mean in a cell phone? | HowStuffWorks
https://electronics.howstuffworks.com/question537.htm
The GSM system uses TDMA to split a frequency into time slots. Probably the most useful thing to know about the Global System for Mobile communications (GSM) is that it is an international standard.
What is GSM? (with pictures)
https://www.wisegeek.com/what-is-gsm.htm
GSM, or Global System for Mobile Communications, is a cellular phone protocol that is standard in most parts of the world. GSM phones use subscriber identity module (SIM) cards, which is essential to...