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What Is A SIM Card For A Cell
Phone?
by: Johnny McKenzie
A SIM card for the phone is like having a small computer
in your computer. The SIM card stores a lot of data such
as your messages, whether text or pictures, your phone
number, reminders, files, value added services etc. What
determine the phone number are actually the card and not
the phone. In fact the mobile phone company keeps track
of all your calls whether incoming or outgoing through
your SIM card. They can identify the precise city and
country that you have taken the phone to. In this way,
the company charges you for the calls.
The SIM card is actually called a Subscriber Identity
Module and is the size of a thumb impression. This tiny
chip is a small microprocessor, but it packs in a lot of
data and information. It’s inserted into the back of the
cell phone that one is using and only then can the cell
phone be activated. As soon as the cell phone is
activated, it’s connected to the network of the cellular
phone company. Thus one can start making and receiving
calls.
Therefore when you switch over to another mobile
company, you need to purchase another SIM card to make
and receive calls. SIMS can have a memory of 16kb to
64kb as of today. Of course with convergence happening,
SIM may have larger memories to take care of many
operations.
There are two types of connections for SIM cards. One is
a prepaid connection where you for a fixed calling
value, let’s say $10, can get for example 100 minutes of
talk time. The second option is that of post paid. After
every billing cycle, the cellular company will charge
you, dependent upon AA you can run a bill of $100
dependent upon the usage. |
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