Combiné is a physical phone designed for children. It gives them voice calls without exposing them to the risks that come with smartphones. Inspired by 90s landlines, it has a reassuring design, programmable favourite buttons, and no screen or app on the child's side. The hardware needed a complete software ecosystem behind it. That meant a mobile app for parents to control how the device is used, a web back office for the Combiné team to manage customers, devices and orders, and a telephony infrastructure to route calls to and from every phone. We delivered a fully operational platform, connected to the existing Shopify store, that covers the whole lifecycle of a device: purchase, automatic activation, parental setup and customer support.