Cách đây 20 năm, 15 nhà điều hành mạng viễn thông đến từ 13 quốc gia đã thống nhất phát triển hệ thống điện thoại di động toàn cầu đầu tiên của thế giới, lấy tên là GSM (Groupe Special Mobile).
Kể từ đó trở đi, số lượng những người sử dụng ngày càng gia tăng đáng kể, khiến cho GSM trở thành chuẩn viễn thông được nhiều dùng nhất so với CDMA.
Hơn 3 tỉ điện thoại di động sử dụng GSM trên phạm vi toàn cầu và con số này vẫn còn gia tăng mạnh với tham vọng chiếm 1 nửa dân số thế giới. Hơn thế nữa, con số này còn chiếm ¾ số thuê bao di động toàn cầu. Hiện tại, GSM và 3GSM đang được sử dụng bởi 700 nhà điều hành viễn thông tại 218 quốc gia và vùng lãnh thổ trên toàn thế giới.
"Hiệp ước năm 1987 được xem là nền tảng cho ngành viễn thông toàn cầu và sự khai sinh ra một trong những thành tựu công nghệ vĩ đại nhất của thời đại chúng ta. Sự hợp tác của chúng ta trên phạm vi quốc tế đã đem lại một cuộc cách mạng kinh tế-xã hội có lợi cho người sử dụng, các doanh nghiệp và các quốc gia trên toàn thế giới", Rob Conway, CEO của GSMA - hiệp hội thương mại toàn cầu dành riêng cho các nhà điều hành viễn thông - phát biểu.
Nhân dịp kỷ niệm 20 năm của GSM, một hội nghị được tổ chức tại Cyprus bàn về những thành tựu mà GSM đã đạt được và những kế hoạch trong tương lai cần thực hiện. Tại sự kiện này, các nhà điều hành mạng như Alcatel-Lucent, Ericsson, Giesecke & Devrient, Hutchison 3G, Nokia Corporation, Nokia Siemens Networks (NSN), Orange, SFR, TeliaSonera, T-Mobile, Vodafone đều có mặt đầy đủ. Vai trò của sự kiện này nhằm kỷ niệm ngày ra đời GSM vào tháng 2 năm 1987 tại Madeira.
Sunday, September 16, 2007
Monday, November 27, 2006
SIM card reader: description & introduction&definition
SIM card readers or editors are hardware-software combinations makes it possible to get access to the SIM card of a mobile phone right on a PC. With a SIM card reader it is possible to view, create, edit, and backup phonebook entries using a PC and stop typing in information using the mobile phone's keypad. PIN codes, transfer data from one SIM to another, backup and export & import all phonebook entries can be managed.
SIM card readers enable to back up the SIM card phonebook data to local memory and avoid data losses in case the user lose or change a SIM card or a GSM phone.
Usually SIM card readers working with any SIM card using any compatible PC/SC smart card reader to set up, transfer and change user data of all languages. Local language characters are correctly displayed on the screen of your mobile phone.
Backup and export/import Dekart SIM Manager has the option of performing backups and then restoring the SIM card phonebook data, as well as exporting and importing phonebooks and address books from other applications.
PIN code management allows changing, unblocking, activating and deactivating SIM card's PIN code.
Most SIM card readers are compatibility with all GSM phones.
How does a SIM card reader works?
The SIM card from GSM phone has to be removed. Insert it into smart card adapter & PC/SC compatible smart card reader and attached it to the PC. Run the software.
You find some new SIM card backup devices at the info site.
SIM card readers enable to back up the SIM card phonebook data to local memory and avoid data losses in case the user lose or change a SIM card or a GSM phone.
Usually SIM card readers working with any SIM card using any compatible PC/SC smart card reader to set up, transfer and change user data of all languages. Local language characters are correctly displayed on the screen of your mobile phone.
Backup and export/import Dekart SIM Manager has the option of performing backups and then restoring the SIM card phonebook data, as well as exporting and importing phonebooks and address books from other applications.
PIN code management allows changing, unblocking, activating and deactivating SIM card's PIN code.
Most SIM card readers are compatibility with all GSM phones.
How does a SIM card reader works?
The SIM card from GSM phone has to be removed. Insert it into smart card adapter & PC/SC compatible smart card reader and attached it to the PC. Run the software.
You find some new SIM card backup devices at the info site.
SIM card description & definition
The SIM - Subscriber Identity Module - is a smart chip card, with the size of a postage stamp. The SIM card contains a microprocessor chip, which stores unique information about your account, including your phone number and identifies you to the network. So it is NOT your cell phone which determines your telephone number, but it is your SIM card. Instead, subscribers activate their phones by inserting SIM cards. Therefore, every time you change your SIM card, you are getting a new telephone number.
A SIM card is actually a tiny computer in your phone. Current SIMs typically have 16 to 64 kb of memory, which provides plenty of room for storing hundreds of personal phone numbers, text messages, value-added services and important for us: position data (coordinates) of tracked animals.
The embedded circuitry located on the SIM card stores information about the services that are available to you as a local subscriber. The SIM card identifies you to the network and contains a microprocessor chip, which stores unique information about your account, including your phone number. The SIM card, provided by a local GSM cell phone operator, snaps into the back of a GSM cell phone to make you a local subscriber.
SIM cards are available on a subscription basis, you sign a contract of a provider and get a bill every month or they are available on a prepaid basis, in which case you buy airtime, as you need it. In other words, you can borrow almost any other GSM phone and insert your own SIM card and make calls as usual. These calls will then appear on your own phone bill, as if made with your own phone. In the world of SIM cards you are not phone dependent, all you need is your own SIM card and almost any GSM phone.
Since - in most cases - the SIM card is removable by the user, it makes it possible to carry your mobile subscription and data through different types and generations of GSM phone. The interfaces between the mobile handset and the SIM card are fully standardized and there are already specifications in place for 3rd generation handsets and SIMs.
Most GSM mobile/cell phones are sim unlocked and will work with any sim card from any carrier in the world. Sim cards may be purchased online for a growing number of select international destinations.
Most GSM phones sold in the U.S. are locked to a single SIM card. Stick another SIM card into a locked phone and it won't work.
Where is the cell phone number of my SIM card?The phone number of your SIM card is usually located somewhere on the packaging. The number printed directly on the SIM card is a SIM card number and is not the phone number.
A SIM card is actually a tiny computer in your phone. Current SIMs typically have 16 to 64 kb of memory, which provides plenty of room for storing hundreds of personal phone numbers, text messages, value-added services and important for us: position data (coordinates) of tracked animals.
The embedded circuitry located on the SIM card stores information about the services that are available to you as a local subscriber. The SIM card identifies you to the network and contains a microprocessor chip, which stores unique information about your account, including your phone number. The SIM card, provided by a local GSM cell phone operator, snaps into the back of a GSM cell phone to make you a local subscriber.
SIM cards are available on a subscription basis, you sign a contract of a provider and get a bill every month or they are available on a prepaid basis, in which case you buy airtime, as you need it. In other words, you can borrow almost any other GSM phone and insert your own SIM card and make calls as usual. These calls will then appear on your own phone bill, as if made with your own phone. In the world of SIM cards you are not phone dependent, all you need is your own SIM card and almost any GSM phone.
Since - in most cases - the SIM card is removable by the user, it makes it possible to carry your mobile subscription and data through different types and generations of GSM phone. The interfaces between the mobile handset and the SIM card are fully standardized and there are already specifications in place for 3rd generation handsets and SIMs.
Most GSM mobile/cell phones are sim unlocked and will work with any sim card from any carrier in the world. Sim cards may be purchased online for a growing number of select international destinations.
Most GSM phones sold in the U.S. are locked to a single SIM card. Stick another SIM card into a locked phone and it won't work.
Where is the cell phone number of my SIM card?The phone number of your SIM card is usually located somewhere on the packaging. The number printed directly on the SIM card is a SIM card number and is not the phone number.
PIN code, PUK code in mobile phones - description & explanation
PIN stands for Personal Identification Number. A PIN code is a numeric value used in certain systems as a password to gain access, and authenticate.
In mobile phones a PIN code locks the SIM card until you enter the correct code. Each mobile phone network sets the PIN number of their SIM cards to a standard default SIM number (you can change this via your handset if you wish, but make sure you don't forget the new code). This protects your account, even if your SIM card is insert into another mobile phone.
That means, if you enable PIN protection on your handset, you will need to enter the PIN code each time you switch your mobile on. If you enter the PIN code incorrectly into the phone 3 times in a row, then the SIM card will be blocked and you will require a PUK code from your network/service provider.
(SIM) PIN code 2
The PIN code 2 are deliverd with the new SIM cards (GSM phase II ). This code controls access to some of the more advanced features of the phone (f.ex. fixed dialling list a restricted list of numbers the phone can call: handy if you lend a phone to kid) . The default code is set by the Service Provider, but you are able to change this code.
PUK stands for Personal Unblocking Key. If you have entered you're PIN code incorrectly 3 times your sim card will be blocked and you will be unable to make and receive calls/texts. You will need to obtain the PUK code from your network provider, or you will need to consult your GSM cell phone manual. Caution: if the PIN code is entered 10 times incorrectly, the card is permantly disabled and the SIM card has to be exchanged.
PUK code 2
This performs the same function as the PUK, but for SIM PIN 2. You should ask your Service Provider for this code when you need it.
In mobile phones a PIN code locks the SIM card until you enter the correct code. Each mobile phone network sets the PIN number of their SIM cards to a standard default SIM number (you can change this via your handset if you wish, but make sure you don't forget the new code). This protects your account, even if your SIM card is insert into another mobile phone.
That means, if you enable PIN protection on your handset, you will need to enter the PIN code each time you switch your mobile on. If you enter the PIN code incorrectly into the phone 3 times in a row, then the SIM card will be blocked and you will require a PUK code from your network/service provider.
(SIM) PIN code 2
The PIN code 2 are deliverd with the new SIM cards (GSM phase II ). This code controls access to some of the more advanced features of the phone (f.ex. fixed dialling list a restricted list of numbers the phone can call: handy if you lend a phone to kid) . The default code is set by the Service Provider, but you are able to change this code.
PUK stands for Personal Unblocking Key. If you have entered you're PIN code incorrectly 3 times your sim card will be blocked and you will be unable to make and receive calls/texts. You will need to obtain the PUK code from your network provider, or you will need to consult your GSM cell phone manual. Caution: if the PIN code is entered 10 times incorrectly, the card is permantly disabled and the SIM card has to be exchanged.
PUK code 2
This performs the same function as the PUK, but for SIM PIN 2. You should ask your Service Provider for this code when you need it.
What is a SIM Card?
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
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
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