Why Choose GSM Cell Phones Over CDMA?

    GSM (Global System for Mobile Communication) is the most widely used wireless mobile communication technology in the world. GSM cell phones are highly popular in Asia, Europe and Australia due to its excellent coverage and flexibility, as against to CDMA (Code Division Multiple Access).

What is a GSM Cell Phone SIM Card?

    Unlike CDMA technology, the GSM phones utilize SIM (Subscriber Information Module) cards. Simply put, a SIM card is a just like any other smart card, such as a credit card. It contains information about user's service subscription and account settings. It allows the cell phone to access the service network through wireless technology. A SIM card also stores essential data such as user's subscription numbers, phone number, security codes and personal contacts. The most important benefit of using a SIM card-based cell phone service provider is that the card can be used in different phone devices. Thus, you can retain the same number while sporting new cell phone devices.

What are Unlocked GSM Cell Phones?

    Unlocked GSM phones are devices that can be used with the GSM SIM cards from different service providers. Thus, if you are planning to shift to a new mobile service provider (such as AT&T, T-Mobile and Cellular One), you are not required to dump your phone. Every time a new SIM card is inserted into the GSM phone device, it starts receiving network connection from the new carrier.

    When visiting a foreign nation with GSM network available, it is possible to buy a local SIM and save on the international roaming charges. However, you have to provide some documentation to procure a new SIM in a foreign nation. Also, you will be able to buy only prepaid GSM SIMs which require you to pay in advance for services.

    It is essential to know that GSM phone devices work on a specific frequency bands for wireless communication. Dual band works in the frequency 900mhz (megahertz) to 1800mhz. Most of the countries follow dual band for GSM services. However, North America is an exception as the region operates on 1900mhz. To ensure that your phone continues to operate across the world, buy a Quand band GSM device. It supports frequencies from 850mhz to 1900mhz.