Android app to use an Android smartphone as an SMS gateway for other web applications. The app polled a backend service for outgoing SMS messages and sent them using the Android SMS API. Incoming SMS messages were forwarded to the backend service as needed. The app was build for an early stage startup with the goal to provide small rented solar systems in Africa (Ghana). After payment the user would receive a SMS with a code to unlock the solar system for a certain time period. The app was deployed in Ghana and was successfully used for a short period of time before the startup pivoted to a different field.