I was helping my younger brother by developing his eCommerce site. This is Bangladesh based eCommerce. He subscribed to a local SMS provider's SMS service to send order status SMS to customers. Unfortunately, that provider does not provide a WordPress plugin.
So, I had to create a plugin for the SMS notification. After creating the plugin I realize, it will help lots of people here if I publish the plugin to WordPress public repository.
So, I published the plugin in the WordPress plugin directory.
In the first released I only included DianaHost (The local provider) SMS gateway in the plugin. I have the plan to add all major SMS provider's gateway in the plugin.
In case anyone needs the source code, I created a Github repository for the plugin.
Free free to clone the code and create your plugin for your gateway.