SMS messaging with a mobile phone attached to the PC
If you plan to send and receive fewer than 15 000 SMS
messages per day, you can use a suitable GSM device (phone or modem)
attached to your computer with a phone-to-PC data cable. For information
about suitable phones, check out the
Supported Phones 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 such as Ozeki
NG - SMS Gateway to send and receive SMS messages. In this case, the 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 link (Figure 1).
Figure 1 - GSM modem connectivity for SMS messaging
When a message is received, the GSM device
stores the message in its memory or on the SIM card, and sends
a notification to Ozeki NG - 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 software, such as Ozeki NG - SMS Gateway
allows you to attach more than one device to your PC and to use
them simultaneously to increase capacity.
The best option to connect a phone to the PC is to use
a standard RS232 serial cable.
USB cables, InfraRed and BlueTooth connections are not as reliable.
You can read more about the connection methods on the following pages:
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RS232 Data Cable