Global System for Mobile Communication (GSM) modem is just a specialized form of modem that operates over paid subscription bases to a wireless network, exactly like a mobile phone. It accepts a Subscriber Identity Module (SIM) and actually performs like a cellular phone for computers. This type of modem can be utilized as a dedicated cell phone that the computer may use for GSM network capabilities. Traditional modem is attached with computers allowing dial-up link with other remote computer systems. Additionally, it functions in a quite similar manner, having an exception that it sends and receives data through radio waves instead of a telephone wire. This kind can be an external device connected using a USB (Universal Serial Bus) cable or a serial cable. Commonly it is really a mini device which can be plugged straight into the USB port or card slot of a PC or even a laptop.
It is a communication device like its ancestors having wires, but since the service is on paid subscription bases, it will have installed a SIM card. This card can connect the modem to the appropriate company and identifies the device user to its carrier network. In this way, it functions almost like a mobile phone; as a matter of fact, many cellular phones make use 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 often 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 will be sent and received the same as 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 using GSM technology so they can act as wireless hotspot for computer when required. They could easily link to the computer via USB cable or even with no wire over a wide-fidelity (Wi-Fi) network and also via Bluetooth. This enables user to gain access to the Internet service employing their cell phone working as a GSM modem as opposed to a normal Wi-Fi connection. All the users who’ve an unlimited data package on their smartphone, this is a cheaper solution than paying extra for a separate Access to the internet, or paying money as a link fee or a membership for a public Wi-Fi hotspot.