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There are two major communication systems used for cell phones. The CDMA system is a coded response system that ties a phone and its user together to a particular system and to a particular number. The CDMA system is widely used in the United States and a few other countries in the World. The second system is known as GSM. This stands for the Global System for Mobile Communication. The GSM system is becoming more popular in the United States and is the common standard in over two hundred other countries in the World.
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The GSM cell phone uses a SIM card to communicate with a particular network. The network providers have the ability to lock the cell phone so that it will not respond to a SIM card from an alternate provider. They do this for competitive purposes, but the practice is deemed unfair by many. When the cell phone is purchased and owned an individual, he should have the ability to change the SIM card and use the phone on any network that he prefers to use. This allows the phone to be used when traveling, especially in foreign countries without paying excessive roaming charges.

So, the question is: how to unlock a cell phone? The first step is to determine the type of phone. If it is a CDMA phone, it does not use a SIM card and there is no need to unlock it. The second step, once you are sure it is a GSM phone, is to determine if it is really locked. The simple way to do this is to borrow a SIM card from a friend with a different service provider and see if this SIM card works in your phone. If you insert the new SIM card, and the phone thinks it is now your friend's phone, it is not locked. If it is locked, you will get some sort of error message.