sending to confirmation to customer via sms.

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C#

ASP.NET

I made a shopping website in ASP.NET using C#.

Any one can select a product and on clicking checkout customer have to fill the information i.e name, address, phone no, e.t.c.
When customer clicks on place order, then that information is saved into the database, and the user is redirected to the order conformation page in which I have shown the order no, product, amount, e.t.c.
I want that when customer clicks to place order the order number, product names and the amount is send to the customer via SMS. (the mobile no will be taken from the user registration table of my login system.)
I want to use mobile phone as my GSM modem.

This is first time I am going to start a coding related to mobiles.

Please anyone help me to do it in an easy way and please help me out how to start.

Any helpful coding examples related to this will be appreciated.