The most common type of SMS used for marketing is promotional messages. These messages are designed to promote products, services, or special offers to a wide audience. Promotional SMS often include details about discounts, new product launches, upcoming sales, or events. 

They are an effective way for businesses to reach their customers, increase brand visibility, and drive sales. Promotional SMS campaigns are known for their widespread use across various industries, as they offer a straightforward and direct method of communicating with a large customer base.

SMS mobile marketing, also known as mobile marketing via text messages, is a marketing strategy that utilises Short Message Service (SMS) to engage with customers on their mobile devices. This approach involves sending text messages to a targeted group of recipients, typically to promote products or services, provide updates, or engage with customers. 

SMS mobile marketing leverages the ubiquity of mobile phones, allowing businesses to communicate directly with their customers, often resulting in higher open rates and engagement than other marketing channels. It's a valuable tool for reaching a mobile-savvy audience and ensuring that marketing messages are seen in a timely manner.

2-Way SMS marketing is a two-way communication strategy that involves sending SMS messages to customers and allowing them to respond with feedback, questions, or requests. Unlike traditional one-way SMS marketing, where businesses only send messages to recipients, 2-way SMS marketing encourages a more interactive and engaging conversation. 

This approach enables customers to actively participate in the communication, providing businesses with valuable insights, resolving queries, and building stronger customer relationships. 2-Way SMS marketing is particularly useful for customer support, feedback collection, and fostering a sense of customer engagement and responsiveness. 

It's a powerful method for businesses to not only broadcast messages but also listen and engage with their audience effectively.

In conclusion, SMS marketing is a powerful tool that offers numerous benefits to small businesses. It provides a direct and immediate channel to communicate with customers, resulting in higher engagement and increased sales. By understanding the various types of SMS marketing and implementing best practices, businesses can unlock the full potential of this marketing strategy.