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| WHAT Does GSM, Lock & Unlock Mean |
| By: Victor Epand |
| The term GSM means - Global System for Mobile
Communications. It is the most popular standard for
mobile phones in the world. GSM differs significantly
from its predecessors in that both signaling and speech
channels are Digital call quality, which means that
it is considered a second generation (2G) mobile phone
system. GSM is an open standard which is currently developed
by the 3rd Generation Partnership Project (3GPP). From
the point of view of the consumer, the key advantage
of GSM systems has been higher digital voice quality
and low cost alternatives to making calls such as text
messaging. The advantage for network operators has been
the ability to deploy equipment from different vendors
because the open standard allows easy inter-operability.
Like other cellular standards GSM allows network operators
to offer roaming services which mean subscribers can
use their phones all over the world. |
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| To help you further understand, GSM is simply
a standard used by phones to communicate with each other.
It is a new standard that has been adopted to all new
models of phones and is now so prevailant that it has
become the 'norm' in the phone world. Now to answer
your other question, with respect to locked and unlocked
phones. A phone is locked when it is attached to network.
For example if you go to AT&T and purchase a phone from
them then that phone is said to be locked unto the AT&T
network and as such it cannot work on another network
such as SPRINT or NEXTEL. Thus an unlocked phone is
a phone that is bought, that is not locked to any network.
And as such it can work on any network. The network
it will lock unto will depend on the SIM card you put
into the phone. For example if you put a AT&T sim in
an unlocked phone then it will work on the AT&T network.
In the same way if you put a NEXTEL SIM card in an unlocked
phone then it will work on the NEXTEL network. However
if the phone is locked to a particular network, like
say for example AT&T then changing the SIM card in the
phone to another SIM card from another network such
as NEXTEL will not work. This is because the phone is
locked unto to AT&T network and as such will not work
on any other network. |
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| Yes, you can use the prepaid SIM card on the
phone once the phone is either unlocked or on the same
network as the SIM card you are going to put into it.
It should work just fine. Unfortunatly is isn't possible
to have more than one phone on the same line. It is
possible to have more to than one phone on the same
account, in fact, some providers will allow many many
lines on one account. The reason why your unable to
do this is that your phone has a ESN (electronic serial
number) that assoicated with that line. What this does
is allow your network to send the calls to your phone.
If there is more then one ESN per line then it will
cause problems receiving calls. For example, I had a
phone that i wasnt using anymore when i bought a new
one, well my old phone was recieving text messages that
my new one was supposed to get, but the new one would
get all the calls. To resolve the issue that had to
erase the programming on the phone. |
| Victor Epand is an expert agent
for http://www.BuyCellularPhones.info, a huge cellphone
superstore featuring great prices and rebates on cellphones
including Motorola, Samsung, Nokia, Audiovox, LG, RIM
Blackberry, Sanyo, Sony Ericsson, and others. Article
Source: http://www.articlerich.com
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