How to setup bidirectional/two way SMS server?

Does any one have any idea/experience in building a 2 way SMS system? Example: Just like how we send a SMS "CRI" to 58888 and we receive the cricket score as reply instantly..

I need to have a setup(with software)...in which if user send an SMS with a keyword...like "LOAN USERID" (for getting his loan details), the system should receive the message, retrieve the relevant data from the SQL database and reply back to him automatically...as an SMS...

Will be glad if anyone can help me out with this...

Cheers
 
not sure about the exact details.
one option is you can get a sms gateway (a search on google would give some info)

or you can use a gsm modem with a SIM card connected to the server.
then you can write mybe a .net application to read the gsm modem and check for new sms then check what is in the sms and then perform a task accordingly and reply using the gsm modem.
you will need to learn about the gsm modem though
 
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