In Senegal, a large part of the population has no identity document or is not recorded in the registers. Several factors may explain this: lack of knowledge and difficulties in accessing civil registration services, lack of confidence in these services and lack of organization of these services. Mobile phones, whose use is spreading across Africa, could be a relevant solution to facilitate the process of birth registration, especially in rural areas. In Senegal, a team of researchers has developed and tested a solution to declare and register births thanks to mobile phones (feature phones). The main objective was to create a simple access tool for people with very little experience of ICTs. Therefore, the singularity was the establishment of a process of co-design with village chiefs and civil registrars who will be end users of the applications. This paper aims to present this experimentation.