Nella mobiili is an Android application developed by Tietoevry that allows users to manage their travel cards. To access the app, users need to log in with their Nella Online Service credentials. If they do not have an account, they can create one with a valid email address.

Once logged in, users can add their own or their family members' travel cards to the app by entering the card number. Additionally, personal travel cards can be added to the user's Nella Online Service account via Suomi.fi e-Identification service, which will make them visible in the Nella Mobile application.

One of the app's features is the ability to purchase tickets online using online banking credentials. However, benefit ticket purchases are not supported at the moment and must be purchased through Nella Online Service.

Overall, Nella mobiili is a convenient tool for managing your travel cards and purchasing tickets on-the-go.