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GSMArena.com - The ultimate resource for GSM handset information
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gsmchoice.com
gsmchoice.com - The biggest mobile phones catalogue. Technical data, information, comparisons, review, users reviews.
Practical guides
- What Is GSM? The 2G Mobile Network Standard Explained
- GSM (Global System for Mobile Communications) is the digital cellular standard that launched commercial service in 1991 and became the foundation of …