Introducing SMS Highlighting Feature

If you have ever run an SMS campaign, you know the feeling. You write a message, hit send, and later realise your credit usage was higher than expected. Not because you sent more messages, but because some of them quietly crossed the character limit and counted as two.

That is how SMS works. When a message exceeds the standard character limit (160 characters for plain text, 153 for multi-part), mobile carriers automatically split it into multiple parts. The recipient sees one seamless message. Your account sees two credits charged.

It is easy to miss. A small copy tweak, an added detail, a slightly longer offer code. Any of these can push a message over the limit without anyone noticing until the bill arrives.

We built SMS Highlighting to fix that.

What Is SMS Highlighting?

SMS Highlighting is a new feature on Mergn that automatically flags any SMS message that exceeds the standard character limit and will be split into multiple parts.

Whenever you are building an SMS campaign and a message crosses that threshold, Mergn highlights it directly within the platform. No separate tool, no manual counting, no guesswork. You see it right there before you send.

Why It Matters

The problem with multi-part SMS is not just the cost. It is the unpredictability. When you cannot see which messages are running long, you cannot make informed decisions about your copy. You end up either overspending without knowing why or over-editing out of caution.

SMS Highlighting changes that. With it, you can identify exactly which messages are consuming multiple credits before a single one is sent. You can optimise your copy length in real time, trimming where needed without losing the message. You can reduce unnecessary SMS spend across campaigns without sacrificing reach or impact. And you can plan your budgets with confidence, knowing your credit usage will match your expectations.

A Smarter Way to Control SMS Spend

Transparency has always been central to how we think about the Mergn platform. Brands should not have to dig through reports after the fact to understand what something cost them. They should have that clarity upfront, when they can still do something about it.

SMS Highlighting is a small feature with a meaningful impact. It gives you one more layer of visibility and control at the exact moment it is most useful, while you are still writing the campaign.

SMS Highlighting is now live on Mergn. The next time you build an SMS campaign, you will know exactly what you are sending before it goes out.