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Different technologies. It's always good to know that wireless phone service providers are using different technologies. Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM). CDMA is using digital modulation for personal communications devices such as mobile phones. CDMA is widespread in the United States. GSM is a digital mobile system widely used in Europe. GSM cellular phone comes with convenient SIM card, also users can find much wider selection of the phones for GSM. Eight simultaneous calls could be done on the same radio frequency by using GSM. The techniques of GSM can be also used for Web-phone communication. You have to know that you cannot use GSM phone for CDMA or CDMA phone for GSM. If you travel overseas or you like changing your handset on the latest cellular phone, may be GSM would be the better choice for you. (But you have to remember, not every GSM cellular phone will work overseas.) You have to ask at the store which telecommunication system is better for you.

Make your decision based on reception in your area. You have to know that different locations have different coverage. It's not really an easy task to find out which location is covered or not by selected cellular phone company. Everything is based on experience, so ask your fiends or relatives which service they are using. May be you should even ask someone to borrow you cellular phone to test it in your area.