Are there commercial solutions similar to messagingtoolkit ?
There are plenty
- mcore SMS library at http://logixmobile.com, available as .NET dll or ActiveX component.
- jSMS from http://www.objectxp.com/en/products/jsms/, written in Java.
- ActiveExperts SMS and MMS Toolkit at http://www.activexperts.com/xmstoolkit/. It supports MMS also.
- Ozeki NG SMS Gateway at http://www.ozekisms.com
- SendXMS at https://www.bai.de/en/sendxms.shtml