| GSM phones are most preferred by people all over the world because of so many reasons. The main reason is that you can put any SIM on any phone and vice versa. Any phone can work with any SIM. As a result of this feature, you need not change phones to use phone cards. Also, if you have already bought an expensive phone and you have learned all the features of it and are quite comfortable using the phone, if you change from one GSM wireless company to another one, you don't have to change phones. All you need to do is replace the first company's SIM with your new service provider's SIM and you can keep the phone you've grown to like. But there are some wireless providers who lock their phones and as a result of this, that their phones have been programmed to only work with SIMs issued by their company. So, if you need to operate your phone with a SIM of your choice, what you have to do is to unlock your phone. GSM is a type of digital mobile phone service. In the US, the more common type of digital mobile phone service is CDMA. But most of the countries in the world uses primarily or only GSM. As with most of the countries, they have several different GSM networks operating within their borders. Multiple choices are offered by even unlikely seeming countries. For example, Afghanistan has four. They are the Telecom Development Company, the Afghan Wireless Communication Company, MTN Group Afghanistan, and Etisalat Afghanistan.
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