Using Mobile phone as GSM modem

This post is dedicated to using the mobile phone as a GSM modem.

SMS Gateway is a server that serves as an interface between ur PC and mobile network. Combined with a GSM modem, one can actually send SMS to any valid mobile phone. The architecture and the design of SMS flow through a PC is shown in the picture.

CASE :
I have used Nokia E61 mobile phone with a GSM SIM card for sending out SMS to valid mobile numbers.
It involves the following requirements for the System:
1. An interface software for the mobile phone to act as a GSM Modem
In this case its Nokia PC tools. Once connected to the system through USB cable, the system recognises it and sets it to Modem configuration provided the system has Nokia PC Suite.There will be a popup window on the phone asking which mode to be selected.
Choose PC suite.

2. An SMS gateway server to interact with the GSM modem.
I have installed ActivXperts SMS gateway free version for testing purposes. Once installed u can actually setup E-mail as well as an SMS gateway through the same server. Go to SMS Messaging Channel Wizard which appears in the Program Files>ActivXperts Software. Choose Create a Channel mode for SMS and Next.
The gateway automatically detects the GSM modems included/connected to the PC. Click on the modem which has the mobile phone name. If the mobile needs a pin to activate that code, then the code is also entered in the same menu.
It will then ask for the GSM number that is present on the phone. Give the number. The next form will ask a sample number to give a test message through the phone. The test message is sent and a confirmation is acknowledged at the PC.
This opens the SMS Server manager. It has log file of all the outgoing and incoming messages through this system, the status of the outgoing messages, failed messages, reasons of failed messages and also all the outgoing messages numbers.
To send an SMS, go to the New message option on the server. This will open up a form to be filled which has channel to be specified as SMS channel which was created earlier with the Mobile phone name.
once the message is created, one can actually schedule it to a particular time to be delivered. the message will be delivered immediately if there is no time specified.

Drawbacks:
Some mobile phones donot give access to the modem once connected to the PC. These will be dedicated to the mobile phone services only.(One such case was with Motorola Razor V8). This makes the device detectable it will not be available for the services of the Gateway server.
Best solution is to install a GSM modem totally dedicated to the Gateway server.
Virtually u are sending SMS through the same phone using the Same GSM SIM card and will be charged on the phone. This problem can be solved by installing GSM modem with a SIM card that has offers for free SMS