The Ecosystem Accelerator programme was launched in early 2016 with the ambition of helping bridge the gap between start-ups and mobile operators, demonstrating that – with the right level of support – innovation can help address local challenges and opportunities in a commercially sustainable manner. Four years on, and as we are now graduating all the start-ups we have been working with, we want to look back at the journey we have had, the impact our work – through the organisations we have supported – has made, and the key lessons we have learned, as well as to thank all who have supported us along the way.