send sms to mobile numbers through vb.net windows application using GSM modem - vb.net

I have developed a windows application in vb.net and now my client wants to add sms feature in that application. i have never used sms feature before so don't have any idea how to get it done. Can anyone tell me how to use GSM modem in order to send sms to recipients through vb.net application?
So far i have designed a GUI with NumberTextBox and SMSBodyTextBox and SendSMSButton. The sms should be sent to number entered in the NumberTextBox including the SMSBody when the user clicks SendSMSButton.
PS: SMS will be sent only by GSM Modem using Local network Sim Card.
Any support regarding this will be highly appreciated.
Thanks

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Have you seen Twilio's REST API for SMS already? https://www.twilio.com/sms/api. That will save you lots of time configuring own GSM modem firmware and maintaining own SMS transactions. With 3rd party SMS service provider you can just focus on your client app such as sending back tutor's profile to the provider and the provider will carry your message push it back to the student's mobile number.
Of course the old way is that everything (data and GSM software) sits within our own network. I used to have HTC's GSM model like 7 years ago) with my J2ME apps for Nokia, HTC and Motorola smartphones. But nowadays, you have lots or cheaper and better options. Even Android phones can be used as bare bones GSM modem already :D
Enjoy!
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