In this post, I’m going to describe how you can build an SMS text audience to run your marketing campaigns. In some ways, this is the hardest part of the process, because you have to build up a roster of numbers in much the same way you’d build up a list of customers for your website or followers on social media. It’s always a challenge! Regardless, the effort is worth it, because the ROI on these campaigns can be insane, even with a relatively small audience.