Which USSD protocols does EMnify support? Jean-Eudes October 26, 2018 06:39 Follow EMnify USSD services support the following protocols: "GSM" "IRA" "UCS2" "UTF-8" For detailed information regarding USSD, please read the USSD Integration Guide. Related articles USSD Integration Guide Which USSD prefix does EMnify support? What is the maximum number of characters for a USSD message? Webinar: Introduction to the EMnify API USSD Introduction Comments 0 comments Please sign in to leave a comment.