The GSMA’s Open Gateway was a significant announcement at MWC2023 – but it builds on the CAMARA project, which has made rapid progress in the last year. Could it hold the keys to new revenue streams for telcos, and in particular from 5G? We hear from two people directly involved in driving the initiative, and put it in context of both earlier telco API efforts, and the work of companies like Twilio and Vonage (Ericsson).