Yabono (com.pilasvacias.yabono.free) on Google Play
With this app you will know at all times the status of your Tarjeta de Transporte Público de la comunidad de Madrid (Madrid Public Transport Card). The new card for subway and bus has a 30 day life cycle starting on the first day of use, by inputting this day on Yabono, Yabono will keep track of the status of your Tarjeta de Transporte Público. You can choose to receive notifications at any time you want to warn you about how long is it untill it expires.