Cell phones are either locked or unlocked. Locked cell phones are those that can be used on only one cell phone carrier. Locked cell phones prevent the user from switching to another carrier. On the other hand, unlocked cell phones or GSM world phones can be easily used on different mobile phone carriers. They offer greater flexibility to the user in terms of changing services as and when required.
GSM cell phones come in four kinds of frequencies. Although, it is better to buy GSM world phone that supports all the frequencies, but you will find that most of them use only two or three frequency bands. While most of the countries use frequency bands of 900 MHz and 1800 MHz, US makes use of the combination of frequency bands 850 MHz and 1900 MHz. It would be good to buy GSM phone that uses frequency of 850 MHz and 1900 MHz, if you are living in the US. But, when traveling outside, buy GSM cell phone that supports 900 MHz and 1800 MHz.
There are various benefits to buy GSM phone. You can use your GSM world phone with any provider. With a GSM phone, you are neither required to get a new mobile connection nor float your number to everyone back at home. GSM service is available in as many as 200 different countries. All you need to do to continue using your GSM world phone is buy a new SIM from any service provider and put it in your phone.
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