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Types of Cellular CarriersThere are two network technologies in place with cellular carriers and service. GSM, which is short for Global System (for) Mobile Communication and CDMA, which means Code Division Multiple Access. All major cellular carries use one or the other of these networks. If you are aware of the differences between the two, it will enable you to choose a cellular carrier that best meets your needs. Obviously the most important consideration is that you have reliable service in your area, with the least amount of dropped calls, and the most amount of "bars" - meaning if you have full "bars", you have cellular service, if, on the other hand, you stray outside your provider's service area, you will not be able to receive or make phone calls. GSM Carriers: Allow international (roaming) calls as they are predominate in today's world market. If you travel abroad your GSM phone can be used. You would simply buy a SIM card with minutes on it and a local number in the foreign country you are in for pay per minute usage. CDMA Carriers: Are not card enabled, therefore international calling is usually not an option. However, some overseas countries now have CDMA networks, so if you plan to travel abroad and think you will need cell phone service, it is a good idea to look into this ahead of time.
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