NonoDigito is a utility app developed by SERCOMTEL S.A. for Android devices. It allows users to easily add or remove the 9th digit from Brazilian cell phone numbers stored in their phone's contact list. This app is especially useful for users who need to update their phone contacts after the implementation of the 9th digit in Brazilian cell phone numbers.

With NonoDigito, users can add the 9th digit to all Brazilian cell phone numbers stored in their contact list. Additionally, for users from the southern region of Brazil (PR, SC, and RS), the app allows them to remove the 9th digit from their cell phone numbers. However, it is important to note that this app is incompatible with some Android 4.4 devices.

Overall, NonoDigito is a simple and useful tool for users who need to update their phone contacts with the new 9th digit in Brazilian cell phone numbers.