Long message best practices

Sending long messages as SMS is a common practice, but it isn’t always ideal due to the risk of carrier blocking or incorrect concatenation. To reduce the likelihood of experiencing these issues, we recommend the following: 

• Avoid sending long messages as SMS since they may not be concatenated correctly due to the differences in encoding and variances in what is supported by destination handsets. For more information about SMS limits and concatenation best practices, see this support article.
• If you plan to send a long message as an SMS, please limit it to fewer than 9 segments as some carriers are blocking messages that contain 10 or more.
• If your message contains 3 or more segments, consider sending it as an MMS using a text file as an attachment.