gsm.jpegGSM stands for Global Systems for Mobile Communication. GSM is the European standard, which has recently spread throughout the world. It is now the most popular system for mobile communication in the world. GSM technology also pioneered the SMS, or text message, which has changed the world of telecommunication as we know it.

For the average consumer, the key feature of GMS technology is its use of the SIM card. A detailed explanation of the SIM card is available in its own link on; however, here is a brief explanation of the advantages of GSM Phones and SIM technology: The SIM card allows you to store your personal information and contact information on a removable card or “chip,” which can then be swapped from GSM phone to GSM phone. This meaning that you can transfer your account, your personal information, and all of your phone numbers to a different phone by simply removing your SIM card from one phone and placing it in another.

GSM uses a variation of Time Division Multiple Access (TDMA) and is the most widely used of the three digital wireless telephone technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. GSM networks operate in four different frequency ranges. Most GSM networks operate in the 900 MHz or 1800 MHz bands. Some countries in the Americas (including Canada and the United States) use the 850 MHz and 1900 MHz bands because the 900 and 1800 MHz frequency bands were already allocated.

GSM is the wireless telephone standard in Europe. GSM has over one billion users worldwide and is available in 190 countries. Since many GSM network operators have roaming agreements with foreign operators, users can often continue to use their mobile phones when they travel to other countries.  Many of today’s GSM cell phones are “tri-band” or “world phones,” which means they can operate on three or more types of GSM frequency (i.e. American and European), allowing consumers to take advantage of this ability to use their own phone throughout many of the countries in the world.

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