List of Delphi GSM Tools VCL, There are: TOxygen SMS, TSMSModule, Boomerang Lite
Oxygen SMS
The TOxygenSMS Component works under Microsoft Windows 95, 98, NT, ME and 2000 operating systems family and supports Borland Delphi version 3,4,5,6,7 and Borland C++ Builder 5.
http://www.oxygensoftware.com
TSMSModule
http://www.anewed.com
Boomerang Lite
BOOMERANG is the component library for GSM communication software development. It contains also the components for SMS support, serial port communication, TAPI communication, simple terminal, EMI(ERMES UCP – universal computer protocol), BMG(BIP/Nokia CIMD – Computer Interface to Message Distribution) connection, GDEP Game Data Exchange Protocol) etc. and several sample applications. The components are primary written for Delphi 5, but they are usable also for Delphi 4&6&7, Kylix 3 and finally for Delphi 8 for .NET Framework.
Some components are available as ActiveX objects usable by any ActiveX capable application (Visual Basic, Visual C#, Visual Basic for Applications, Delphi etc.).