What is GSM

GSM is a group mobile experts’ name (French: Groupe Spécial Mobile) acronym. Later, the meaning of the acronym was changed to “Global System for Mobile Communications” to facilitate the promotion of GSM to the world. GSM is the world’s most popular standard for mobile phone systems. It is used by over 1.5 billion people across more than 212 countries and territories. It differences from its predecessor technologies in that both signaling and speech channels are digital, and thus GSM is considered a second generation (2G) mobile phone system.
The early 1980s, the first generation of mobile phone technology began to use, when the existence of many incompatible standards. The user’s mobile phone can not use on other network criteria, that resulting in great inconvenience. Because of this reason, Western European countries began to consider developing unified next generation mobile phone standards.
In 1982, the European Conference of Postal and Telecommunications Administrations (CEPT) created the Groupe Spécial Mobile (GSM) to develop a standard for a mobile phone system that could be used across Europe. In May 1987 GSM members agreed to determine the GSM of the most important of several key technologies. In 1989, GSM responsibility was transferred to the European Telecommunications Standards Institute (ETSI). In 1990, the first edition of GSM standard has be completion. In 1991 the first GSM network was launched by Radiolinja in Finland with network infrastructure provided by Telenokia and Siemens Networks which later on merged as Nokia Siemens Networks. By the end of 1993, over a million subscribers were using GSM phone networks being operated by 70 carriers across 48 countries.
From a user perspective, GSM can provide higher quality digital voice. From the network operator point of view, them can deploy equipment from different vendors, because as an open standard GSM provides easy interoperability.

Secret Codes for Nokia

Codes :
1) *#06# For checking IMEI(international Mobile Equipment Identity)
2) *#7780# Reset to factory settings
3) *#0000# To view software version
4) *#2820# Bluetooth device address
5) *#746025625# Sim clock allowed status
6) #pw+1234567890+1# Shows if ur sim as any restrictions

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