Send and receive SMS messages via a GSM/GPRS modem, HTTP-POST provider, SMPP provider or TAP/UCP provider. Send and receive MMS messages via MM1 (GPRS), MM4 (SMTP) or MM7 (XML/SOAP). Samples included for Visual Basic, Visual C++, Visual Basic .NET, Visual C# .NET, ASP, ASP .NET, Javascript, Delphi, Borland C++ Builder, PHP and more. Awarded with the 'Software of the Year' award by SmsSolutions.net in 2007 (see also http://www.smssolutions.net)

ActiveSMS is an ActiveX DLL that allows you to fully handle GSM, GPRS, HSCSD and UMTS terminals. Developers can integrate the following features in their application:
Reception and forwarding of text messages
Reception and forwarding of Flash messages.
Multiple forwarding of SMS.
Status report handling.
Voice call handling (both incoming and outgoing).
Reception and forwarding of binary messages.
Handling of phonebooks.

Ace sms ActiveX SDK is a great tool to send receive Unicode SMS via GSM phone or Modem from windows system,AceSMS ActiveX is designed to work with a wide range of phones (Nokia:
Siemens:MotoFalcom: GSM Modem Wavcom Modem TC35 Modem
AceSMS ActiveX is based on a widely accepted Technical Specification known as :
GSM0705 All phone and modem support GSM0705 GSM0340 can use this controls to receive/send Unicode SMS,write/read Unicode PhoneBook

ActiveX component (DLL) for sending and receiving SMS from PC using a GSM modem. Very simple usage in Visual Basic, ASP, C#(.NET), C++, Access(VBA) etc. Features: sending, receiving, status reports, long and binary sms (logo/ring/ems), validity period, class, phonebook management, call forwarding. Compatibility: Audiotel Industrial, Modex USB, Falcom A2D, Nokia 7110/6210, Siemens MC35/TC35, Wavecom... 20 sms/minute. Help online available.