My Website offers GSM Unlocked Cell Phones. The Article written below is to give the shoppers information about these products.
GSM (Global System for Mobile Communications) Unlocked Cell Phones
GSM is the technology that dominates most of the world's mobile phone networks. The GSM platform is a broadly successful wireless technology and an unprecedented story of global achievement and cooperation. It is the world's fastest growing communications technology of all time and the leading global mobile standard, spanning 214 countries. You can be instantly contacted on your own phone number in over 100 countries world wide, when you travel with your GSM phone outside of your country or region.
GSM is a cellular network, which means that mobile phones connect to it by cells in the immediate vicinity. GSM phones is the most popular standard mobile phones and is used by over 2 billion people in the World. Consumers benefits from the ability to roam and switch carriers without switching phones. Network Operators who can choose equipment from any Vendor who implements GSM can also benefit from this network. GSM also introduced a low-cost alternative to voice call the Short Message Service (SM, also called "text messaging").
GSM has a moderate level of security. It was designed to authenticate the subscriber using a pre-shared key and challenge response. The subscriber and the base station communication can be encrypted. GSM uses several cryptograptic algorithms for security.
The advantage of purchasing a GSM phone, is that you can unlock it and switch to any GSM Network carrier. Most customers uses GSM on a local network to avoid paying for International roaming. The key is the SIM Card which stores the essential information: carrier, number, and contacts in all GSM phones. Once you phone is unlocked, you can switch carriers of phone by putting in a new SIM Card which is available at any cell phone store. Some of the major GSM Service Providers are AT&T, T-Mobile, Sprint, Cingular and Northwestern Bell. When you call a GSM Service Provider, give them the IMEI number of your phone in order to generate your unlock code.
