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http://laptrinhvb.net/bai-viet/chuyen-de-vb-net/Lap-trinh-ung-dung-goi-tin-nhan-SMS-qua-thiet-bi-DCOM-3G-(Su-dung-lenh-AT-Command)-VB-NET/ddffaffa9f757f8d.html
Tutorial Send and Receive SMS Free AT DCOM 3G VB.NET C#
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