SMS vs. MMS Messages

Last updated: November 13, 2026

If you're sending marketing messages through OneText, you've likely seen options for both SMS and MMS. While they may seem similar, the two formats differ in how they're delivered, priced, and consumed - and that has a direct impact on performance and ROI.

Here's what you need to know:

  • SMS (Short Message Service) is the standard text format - plain text, no media.

  • MMS (Multimedia Messaging Service) supports images, gifs, contact cards, and longer character counts. It delivers a richer experience but comes at a higher cost per message.

Feature

SMS

MMS

Message Type

Text only (including emojis)

Text + media (image, gif, contact cards, video, audio)

Character Limit

160 characters for a single segment. Longer messages are split into segments of 153 characters. If your message includes an emoji or special character, these drop to 70 and 67.

~1,600 characters

Delivery Speed

Fast

Slightly slower

Cost

Lower per segment, but charged for every segment

Higher (charged as one MMS message)

Best For

- Urgent updates
- Flash sales
- Transactional

- Product launches
- Branded promos
- Visual stories

Billing

Charged per segment (e.g., a 3-segment message costs 3x a 1-segment message)

Charged as one message, regardless of character count. MMS are usually billed at a 3-4 unit multiplier, so please check your plan to see the cost for your MMS messages.

ROI Tip

Keep it short, lead with value

Use eye-catching visuals with concise, clear copy and engaged segmentation

Screenshot 2025-04-12 at 12.54.47 PM.png
The OneText dashboard features a built-in character and cost calculator on every message

Watch out for emojis: Adding a single emoji or special character (like curly quotes or certain symbols) changes how the whole message is encoded. A segment drops from 160 characters to 70, so a message that fit in 1 segment can suddenly become 3. Check the segment count in the dashboard before sending.

When to switch from SMS to MMS

Because MMS is charged as one message no matter the length, long SMS messages can cost more than the same message sent as an MMS. The break-even point depends on your plan's MMS multiplier:

  • 3x multiplier: At 3 SMS segments (about 307+ plain-text characters), MMS costs the same. At 4 or more segments, MMS is cheaper.

  • 4x multiplier: At 4 SMS segments, MMS costs the same. At 5 or more segments, MMS is cheaper.

If your message runs to 3 or more SMS segments, check the cost calculator in the dashboard. Converting it to an MMS by adding an image is often the more cost-effective option.

How to Get the Best ROI from Each

For SMS:

  • Keep your copy concise and clear - focus on a single CTA

  • Send during optimal time windows (and respect quiet hours)

  • Use emojis sparingly (or not at all) to keep your segment count low

For MMS:

  • Use high-quality visuals that load quickly and look great on mobile

  • Pair images with minimal, clear copy and a strong CTA

  • Reserve MMS for high-impact campaigns (launches, VIP offers, major promos)

SMS is ideal for speed and scale. MMS is ideal for branded storytelling and visual impact. Both can drive results - just choose the right format based on the message, the moment, and the margin. If you're ever unsure, A/B test both formats and compare performance.

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