Columbia ISA
Audio – Video

How to Buy a Pre-Paid Cell Phone



HDTV 2009
Sony 40" LCD
Sony 32" LCD
Samsung 40" LED
Panasonic 65"

Cable connections
Wiring Diagrams Index

   Pre-Paid Cell Phones

Surround Sound over HDMI
How to hookup surround sound
Surround Sound Glossary
Blu-ray audio surround sound

2009 saw the introduction of Internet-capable HDTVs and also Internet-capable Blu-ray Players with Wi-Fi.

Blu-ray Players -
Sony BDP-N460 Network Blu-ray Disc player
Samsung BD-P4600 Blu-ray Disc player

Learn about BD-LIVE
Blu-ray Basics

How to buy a prepaid phone

What is a SIM card?

SIM card, short for Subscriber Identity Module is a tiny thumbnail-sized encoded circuit which is fitted into GSM cell phones. The electronic circuit card holds the details of the subscriber, security data, and memory to store personal phone numbers. A SIM card stores information which helps the network service provider to recognize the caller.

A SIM card is a removable memory card and can be put into any compatible GSM cell phone, permitting the user to keep the same phone number while changing handsets.

A SIM card is a digital identification chip in cell phones. The validation and encoding ability of a SIM help to stop your cell phone from being stolen and your conversations from being overheard. The SIM stores personal data, user ID and billing information and can be interchanged between phones. So you can easily receive personal calls even while using someone else's phone just by installing your unique SIM in that cell phone.

Some cellular phone carriers sell phones in a "locked" condition (either locked in with a particular service provider or a specific SIM). If you have such a cellular phone then you will not be able to use different SIM cards with it unless you can "unlock" your phone. If you have a country specific SIM card then it will most likely work only in the country of its origin. A U.S. specific SIM card may give you limited coverage while traveling through Europe. Most country specific SIM cards have voice mail so a caller can leave you a message if your cell phone is turned off or not reachable.

Ever misplaced your cell phone or had it stolen? Well, buying a new cell phone is bad enough but trying to replace all the numbers stored in your old SIM card can be an impossible task. A SIMKey Keyring Databank is a novel device which helps you to backup your SIM data so that you never have to worry about losing vital information. You simply put your SIM card into this device, follow the simple directions and have a backup SIM card ready. This is handy not just if your cell phone is stolen but also if you decide to change your SIM card and get a new one.

A SIM card or Subscriber Identity Module is a portable memory chip used in some models of cellular telephones. The SIM card makes it easy to switch to a new phone by simply sliding the SIM out of the old phone and into the new one. The SIM holds personal identity information, cell phone number, phone book, text messages and other data. It can be thought of as a mini hard disk that automatically activates the phone into which it is inserted. A SIM card can come in very handy. For example, let's say your phone runs out of battery power at a friend's house. Assuming you both have SIM-based phones, you can remove the SIM card from your phone and slide it into your friend's phone to make your call. Your carrier processes the call as if it were made from your phone, so it won't count against your friend's minutes.

If you upgrade your phone there's no hassle involved. The SIM card is all you need. Just slide it into the new phone and you're good to go. You can even keep multiple phones for different purposes. An inexpensive phone in the glove compartment, for example, for emergency use, one phone for work and another for home. Just slide your SIM card into whatever phone you wish to use. High-end cell phones can be very attractive and somewhat pricey. If you invest in an expensive phone you might want to keep it awhile. Using a SIM card, it is even possible to switch carriers and continue to use the same phone. The new carrier will simply issue you their own SIM card. The phone must be unlocked, however, and operate on the new carrier's frequency or band.

A SIM card provides an even bigger advantage for international travelers -- simply take your phone with you and buy a local SIM card with minutes. For example, a traveler from the U.S. staying in the U.K. can purchase a SIM card across the pond. Now the phone can be used to call throughout England without paying international roaming charges from the carrier back home.

SIM cards are used with carriers that operate on the Global System for Mobile Communication (GSM) network. The competing network is Code Division Multiple Access (CDMA), a technology created by U.S. company Qualcomm. As of fall 2005, CDMA cell phones and CDMA carriers do not support SIM cards in most parts of the world, though this is changing. A CDMA SIM card called the R-UIM (Re-Useable Identification Module) was made available in China in 2002, and will eventually be available worldwide. Expectations for the future include a cell phone market that supports both SIM (GSM) and R-UIM (CDMA) cards by default.

The actual SIM card in this photo is the small punch-out with the " T " on it (for T-Mobile). It is contained on a credit card sized card with the serial number for the SIM card. Break off the SIM card from the backing card and insert into cell phone. Make sure the contacts on the SIM card touch the appropriate contacts in the cell phone.

How to buy a prepaid cell phone - Carriers, Providers

How to buy a prepaid cell phone - Advantages, Disadvantages, Plans, E-mail

How to buy a prepaid cell phone - How I did it. Real world experience Step by Step

How to buy a prepaid cell phone - SIM card

How to buy a prepaid cell phone - Details about Providers, Phones

Surround Sound
Audio and Video Cables
Blu-ray Surround Sound
Blu-ray Basics
Blu-ray BD-LIVE
Blu-ray and HDTV
Blu-ray Players Samsung 2009
Blu-ray Player Sony BDP-S560
Blu-ray Player Sony BDP-N460
Video cable connections
Cable TV video cables
DVD cables
Camcorder Formats
Camcorder - How to choose
CRT Phosphors
Hookup diagram hdmi bluray
100 hookup diagrams
DVD connect
DVD Glossary
DVD player - How to connect
DVD Introduction
DVD players
DVD buying guide
DVD Primer
RF Modulator hookup for DVD
DVD sound
DVD info
DVD player trouble-shooting
HDMI Switch Box
Panasonic 65 inch HDTV 2009
Samsung HDTV LED 2009
Sony HDTV 32 inch S5100 2009
Sony HDTV 40 inch S5100 2009
How to add great sound to your HDTV
How to add great sound
Internet-ready HDTV
Diagram RF Modulator
Surround Sound Glossary
How to hookup surround sound
Surround sound over HDMI
TV introduction
VCR basics



Empowering consumers thru information.