What is the character limit for SMS text messages?

Max 160 Latin characters or 70 Unicode characters.

If you include any non GSM-7 characters in your message body, we will automatically fall back to UCS-2 encoding (which will limit message bodies to 70 characters each). Additionally, Apifonica prepends a User Data Header of 6 Bytes (this instructs the receiving device on how to assemble messages), leaving 153 GSM-7 characters or 67 UCS-2 characters for your message.