Unlocked Gsm Cell Phone

Unlocked GSM Cell Phones

Executive Summary About Best Cell Phone by Dhaval Suthar

This is done by the service providers to protect their own business. In another scenario, the user may grow dissatisfied with the quality of the service and/ or the rates of the service provider. But in order to change the service provider he/ she has to give up the phone.

Several GSM phones are dedicatedly built for specific service providers. Some phones can be unlocked by feeding into them a secret code. This code is usually unique to the phone and based upon its IMEI number and the service provider that locked it. Some phones are programmed to work only with a certain service provider. In such cases the phone's operating system software needs to be reprogrammed to unlock it. The easiest way out is to go and buy an unlocked phone!

Buyers Guide For Unlocked GSM Cell Phones
Executive Summary About Best Cell Phone by Wasim Rangoonwala

GSM network uses four frequency range 850 MHz, 900 MHz, 1800 MHz and 1900 MHz.

Dual-band:

Frequency Operation Mode: 900 MHz and 1800 MHz.

Tri-band

These phones will work around the world including United States and Canada but will not work with the service provider that only supports 850 MHz frequency.

Frequency Operation Mode: 900 MHz, 1800 MHz and 1900 MHz.

Quad-band

Quad band phones will work all over the world with all GSM service providers.

Frequency Operation Mode: 850 MHz, 900 MHz, 1800 MHz and 1900 MHz.

Countries: Europe, Africa, Asia, United States, Australia, New Zealand, South America and almost all the countries.

United States support 850 MHz and 1900 MHz frequency band. What is Unlocked GSM Cell Phones?

Most cell phones service provider companies such as T-Mobile, Cingular etc provide cell phones to users which are network locked.

Please find my other guide on razr phone