SMS Messages

This section outlines what you need to know to create, edit, delete an SMS message in Bronto.

For optimal results, become familiar with the requirements and specifications in this topic.

SMS and MMS Compliance

SMS and MMS messages must follow applicable compliance standards.

SMS Character Limits and Split Messages

An SMS message has a 160 character limit unless it contains one or more non-GSM characters. SMS messages with non-GSM characters are limited to 70 characters. If you create an SMS message that exceeds the character limit then it will be split into multiple SMS messages. Each message will count against your SMS allocation. A bounced SMS message does not count against your SMS allocation.

Note: GSM is the approved character set used in SMS messaging.

SMS Multimedia

You can include multimedia content in your SMS using the Media URL, which will make the message an MMS message. The link you provide must be a valid link to one of the following:
  • Images: JPEG, GIF, and PNG are fully supported and BMP are accepted but will not be reformatted for device compatibility
  • Audio: basic, L24, MPEG, ogg, vorbis, vnd.rn-realaudio, 3gpp, 3gpp2, ac3, vnd.wave, webm, amr-nb, and amr are accepted but will not be reformatted for device compatibility
  • Video: mpeg, quicktime, webm, 3gpp, 3gpp2, 3gpp-tt, H261, H263, H263-1998, H263-2000, and H264 are accepted but will not be reformatted for device compatibility
Note: MP4 is supported for SMS messaging. However, you must host the audio or video file outside of Bronto.

SMS File Size Limits

File Size Limitations:

  • For image file types, the file must be less than 5 MB.

  • For audio and video file types, the size limit depends on the receiving carrier.

    The following are the current size limitations per carrier:

    • AT&T 1.4 MB
    • Sprint 1.4 MB
    • T-Mobile 0.675 MB
    • Verizon 0.675 MB
    • Other Less than 600 KB is a general recommendation for other carriers which support MMS messages.