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|WHAT Does GSM, Lock & Unlock Mean
|By: Victor Epand
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
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
|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.
|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
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
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