Global System for Mobile Communication (GSM) modem is just a specialized form of modem that operates over paid subscription bases to an instant network, exactly like a mobile phone. It accepts a Subscriber Identity Module (SIM) and actually performs like a cellular phone for computers. Such a modem can be utilized as a passionate cell phone that the computer can use for GSM network capabilities. Traditional modem is attached to computers allowing dial-up connection to other remote computer systems. Additionally, it functions in a quite similar manner, with an exception so it sends and receives data through radio waves rather than a telephone wire. This type is an external device connected using a USB (Universal Serial Bus) cable or even a serial cable. Commonly it is really a mini device that may be plugged straight into the USB port or card slot of a PC or perhaps a laptop
Sim vinaphone .
It is a communication device like its ancestors having wires, but because the service is on paid subscription bases, it will have installed a SIM card. This card can connect the modem to the correct company and identifies the device user to its carrier network. In this way, it functions almost like a cell phone; as a matter of fact, many mobile phones take advantage of SIM cards for the said purpose. The SIM cards actually contain all an individual data like subscription, membership and caller’s logs etc. these SIM cards are usually inter-changeable among GSM modems and GSM cell phones. Similarly dial-up modem converts analog signals to digital and vice versa, GSM modems convert digital data to SMS (Short Message Service) message for sending or receiving message within the wireless phone network. SMS messages are small packets of electric data that is sent and received just like the information packets on dial-up modem.
GSM Cellular Modem
Several new brands of third-generation (3G) and fourth-generation (4G) expensive smart phones are employing GSM technology so they can act as wireless hotspot for computer when required. They can easily be connected to the computer via USB cable or even without a wire over a wide-fidelity (Wi-Fi) network and also via Bluetooth. This enables user to access the Internet service employing their mobile phone working as a GSM modem instead of a traditional Wi-Fi connection. All of the users who’ve an unlimited data package on the smartphone, this can be a cheaper solution than paying extra for another Access to the internet, or paying money as a link fee or a membership for a public Wi-Fi hotspot.