SMS click-through rates average 19-35%, compared to roughly 2.5% for email (Omnisend, 2026). Yet most affiliate marketers treat SMS copy as an afterthought, cramming a link and a generic pitch into 160 characters. That's a costly mistake. In SMS marketing, every single character either earns a click or wastes money. There's no subject line to save you, no hero image to catch the eye. Your words are all you've got.