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? How do I set up a USSD dialog? What is the maximum number of characters for a USSD message? USSD Introduction Comments 0 comments Please sign in to leave a comment.