GSM SMS refers to the process when SMS messages are sent from PC via one or more
attached GSM device with the help of an SMS gateway software. GSM SMS is ideal for
sending and receiving fewer than 15 000 SMS messages per day, since the capacity of
one GSM modem is about 6-10 SMS per minute.
SMS over GPRS
GSM SMS is available by using a suitable GSM device (phone or modem) attached to the
computer with a phone-to-PC data cable. For information about suitable phones, check out
the GSM devices page. The GSM device has to
be equipped with a SIM card that charges (preferably) low rates for SMS messages.
With this setup you can use a computer program (SMS gateway) to
send and receive SMS messages. In this case, the SMS gateway software uses the attached device
to communicate with the GSM network. If a message is sent out by the gateway running
on the computer, it is first sent to the attached GSM device. Then the GSM device
transmits it to the SMS Center (SMSC) of the GSM service provider, using a wireless
When a message is received, the GSM device stores the message in its memory or on the
SIM card, and sends a notification to the SMS gateway. When the program receives
this notification, it retrieves (reads) the message from the respective memory cell,
and then deletes the message from the device to make room for the next incoming message.
The advantage of using a cellular modem is that you do not need Internet connection
for SMS messaging. Sending an SMS message using a cellphone takes about 5-6 seconds.
Receiving takes about the same time. Good SMS softwares allow you to attach more
than one device to your PC and to use them simultaneously
to increase capacity.
As a cellular network, GSM allows mobile phones to connect to it when searching
for cells in its proximity. The cell network is created through antennas that
transmit radio signals by way of dedicated carrier frequencies (850 MHz, and
1900 MHz in Canada and the United States; 900 MHz, or 1800 MHz in other
countries) with a coverage area of 35 km, or 22 miles.
How to connect the GSM modem to the PC
Sending SMS through GPRS is not a commonly used method for SMS messaging,
since most mobile network providers do not support SMS over GPRS. This
connection, however, if configured and supported by the mobile network,
it allows about 30 SMS messages to be sent within a minute. This proves
to be effective because of the high throughput rate it can achieve.
SMS messaging through the computer
After connecting the GSM device to the PC with the appropriate
connection, the computer must be configured to instruct the connected device to
send or receive SMS messages. You can check the availability of the GSM modem with
Microsoft’s HyperTerminal by entering AT commands
Click here for more information on AT commands >>>>
If the GSM modem is available you can start to use an SMS Gateway
for SMS messaging,
which allows a more convenient SMS
messaging through its User Interface. An SMS Gateway software product often
allows for a higher SMS messaging rate, and some allow more simultaneous
connections. SMS messaging rates depend on the license of the SMS gateway
To get more information, please visit the following websites:
The Ozeki NG SMS Gateway website
The best site about SMS integration