Buyers Guide For Unlocked GSM Cell Phones
Posted on July 5, 2008
Overview
GSM: The term used for Global System
for Mobile Communication. It is a worldwide accepted cellular network
standard which uses a SIM (Subscriber Identification Module) card to
make and receive calls and data over the network. The SIM card holds
the phone number assigned by the service provider, your phonebook and
other registration information. GSM standard is used by approximately
213 countries with over 3 billion people. GSM network uses four
frequency range 850 MHz, 900 MHz, 1800 MHz and 1900 MHz.
Dual-band:
These phones will work around the world but not in United States and Canada.
Frequency Operation Mode: 900 MHz and 1800 MHz.
Countries: Europe, Africa, Asia, Australia, New Zealand and much of South America.
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.
Countries: Europe, Africa, Asia, nearly all of United States, Australia and New Zealand.
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.
If
you are purchasing a Cell Phone check the above frequency band and make
sure that the cell phone band is supported in the country. United
States support 850 MHz and 1900 MHz frequency band. Majority of
carriers in US such as T-Mobile, Cingular uses 1900 MHz frequency and
in some state Cingular uses 850MHz 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. This means that,
the phones can only be worked with their company’s network.For example,
a locked phone from T-mobile wouldn’t work with Cingular’s service. So
if you want to use your cell phone anywhere in the world with any
service provider you have to purchase unlocked cell phones which are
not Network Locked by any service provider and you have to just
transfer your existing SIM card into your new unlocked phone and your
phone is all set to make and receive calls.
By purchasing an
Unlocked GSM Cell Phone a customer is having a freedom to switch
between cellular companies anytime , anywhere all over the world.For
purchasing Unlocked GSM Cell Phones please visit http://www.eStoreOffer.com
About the author
Tags: africa asia, asia australia, australia and new zealand, cellular network, cingular, dual band, europe africa, frequency band, frequency operation, global system, gsm service, gsm standard, information gsm, mhz frequency, mobile communication, operation mode, quad band, service provider companies, sim card, t mobile
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